%
% \cite<prefix>[postfix]{keys}
%     (prefix author1, year1; ... ; authorN, yearN, postfix)
% \citeA[postfix]{keys}
%     author1 (year1), ..., authorN (yearN, postfix)
% \citeR<prefix>[postfix]{keys}
%     prefix author1, year1; ... ; authorN, yearN, postfix
% \citeS[postfix]{keys}
%     author1's (year1), ..., authorN's (yearN, postfix)
% \citeauthor{keys}
%     author1, ..., authorN
% \citeyear[postfix]{keys}
%     (year1, ..., yearN, postfix)
% \citeyearR[postfix]{keys}
%     year1, ..., yearN, postfix
%
% For each of the above, \full... and \short... versions are avilable.
%

% \bibparsep determines the vertical space between bibliography entries.
% That is, the vertical space is
%
%     \baselineskip + \parsep (=\parskip) in list env + \bibparsep
%
% The default \bibparsep is 0pt. To change it, e.g.
%
%		\bibparsep=2pt plus 1pt minus 2pt
% or
%                   \bibparsep=-\parsep

% 1997/06/03: All \cite and \nocite commands are robust.

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{theapa}
              [1997/06/03 Version 3.0 APA Citation Style]

%%%%%%%%%%%%%%%%%%%%%
% cite punctuations %
%%%%%%%%%%%%%%%%%%%%%

\def\BBOP{(}                % open parenthesis
\def\BBAA{\&}               % between authors in parenthesis and ref. sec.
\def\BBAB{and}              % between authors in text
\def\BBAY{, }               % between author(s) and year
\def\BBC{; }                % between cites
\def\BBN{, }                % before note
\def\BBCP{)}                % closing parenthesis
\def\BBOQ{}                 % open quote for article title
\def\BBCQ{.}                % closing quote for article title
%
\def\BBA{\BBAA}
%
\def\citepunct#1#2#3#4#5#6#7#8#9{%
    \def\BBOP{#1}
    \def\BBAA{#2}
    \def\BBAB{#3}
    \def\BBAY{#4}
    \def\BBC{#5}
    \def\BBN{#6}
    \def\BBCP{#7}
    \def\BBOQ{#8}
    \def\BBCQ{#9}
    \def\BBA{\BBAA}}
%
\def\BBACOMMA{,}	   % comma between authors in ref. sec
                           % when no. of authors = 2
\def\NoCommaBetweenTwoAuthors{\def\BBACOMMA{}}
%
\let\Bem\itshape

%%%%%%%%%%%%%%%
% cite labels %
%%%%%%%%%%%%%%%

\def\BED{ (Ed.)}                % editor
\def\BEDS{ (Eds.)}              % editors
\def\BVOL{Vol.}                 % volume name
\def\BNUM{No.}                  % number name
\def\BEd{edition}               % edition
\def\BPG{p.}                    % page
\def\BPGS{pp.}                  % pages
\def\BCH{chap.}                 % chapter
\def\BTR{Tech.\ rep.}           % (default) technical report type name

\def\citelabels#1#2#3#4#5#6#7#8#9{%
     \def\BED{#1}                % editor
     \def\BEDS{#2}
     \def\BVOL{#3}
     \def\BNUM{#4}
     \def\BEd{#5}                % edition
     \def\BPG{#6}
     \def\BPGS{#7}
     \def\BCH{#8}
     \def\BTR{#9}}

%%%%%%%%%%%%%
% citations %
%%%%%%%%%%%%%

\def\@lbibitem[#1]#2{\def\BBA{\BBAA}\item[\@biblabel{#1}]\if@filesw
      { \def\BBA{\string\BBA}%
        \def\protect##1{\string ##1\space}\immediate
        \write\@auxout{\string\bibcite{#2}{#1}}%
	\def\BBA{\BBAA}}\fi\ignorespaces}

% Year is separately handled by \Y<citation key>
\def\bibcite#1#2{\global\expandafter\def\csname b@#1\endcsname{#2}% names
    \global\expandafter\def\csname Y@#1\endcsname{\@year@#2}}% year
\def\@year@\BCAY#1#2#3{#3}

% first author of a multi-author reference?
\newif\if@F@cite\@F@citetrue

%
% \cite<prefix>[postfix]{keys}
% \fullcite<prefix>[postfix]{keys}
% \shortcite<prefix>[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces (prefix Authors1, Year1; Authors2, Year2; ..., postfix)
%

\DeclareRobustCommand{\cite}{\def\BCAY##1##2##3{\BCA{##1}{##2}}%
    \@ifnextchar<{\@cite}{\@cite<\relax>}}

\DeclareRobustCommand{\fullcite}{\def\BCAY##1##2##3{\BCA{##1}{##1}}%
    \@ifnextchar<{\@cite}{\@cite<\relax>}}

\DeclareRobustCommand{\shortcite}{\def\BCAY##1##2##3{\BCA{##2}{##2}}%
    \@ifnextchar<{\@cite}{\@cite<\relax>}}

\def\@cite<#1>{\@ifnextchar[{\def\@BBN{\BBN}\@@cite<#1>}%
                             {\def\@BBN{\ignorespaces}\@@cite<#1>[]}}
\def\@@cite<#1>[#2]#3{%
    \if@filesw\immediate\write\@auxout{\string\citation{#3}}\fi%
    \edef\@citeP{}%
%    \BBOP{\ignorespaces#1\space}%
    \BBOP{\if#1\relax\else#1\ \fi}%
    \@for\@citeb:=#3\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}%
       \def\BCA##1##2{##1}}%
      {\def\BCA##1##2{##2}}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \ifx\@citeP\B@my@dummy%
        \if@F@cite\@F@citefalse\else{,\ }\fi%
	\csname Y@\@citeb\endcsname%
    \else%
        \if@F@cite\@F@citefalse\else{\BBC}\fi%
	\edef\@cite@undefined{?}%
	\ifx\@cite@undefined\B@my@dummy%
	  \csname Y@\@citeb\endcsname%
	\else%
	  \def\BBA{\BBAA}%
	  \csname b@\@citeb\endcsname\BBAY\csname Y@\@citeb\endcsname%
        \fi%
    \fi%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #2}\BBCP}

%
% \citeR<prefix>[postfix]{keys}
% \fullciteR<prefix>[postfix]{keys}
% \shortciteR<prefix>[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces prefix Authors1, Year1; Authors2, Year2; ..., postfix
%       i.e., no parentheses
%

\DeclareRobustCommand{\citeR}{\def\BCAY##1##2##3{\BCA{##1}{##2}}%
    \@ifnextchar<{\@citeR}{\@citeR<\relax>}}

\DeclareRobustCommand{\fullciteR}{\def\BCAY##1##2##3{\BCA{##1}{##1}}%
    \@ifnextchar<{\@citeR}{\@citeR<\relax>}}

\DeclareRobustCommand{\shortciteR}{\def\BCAY##1##2##3{\BCA{##2}{##2}}%
    \@ifnextchar<{\@citeR}{\@citeR<\relax>}}

\def\@citeR<#1>{\@ifnextchar[{\def\@BBN{\BBN}\@@citeR<#1>}%
                             {\def\@BBN{\ignorespaces}\@@citeR<#1>[]}}
\def\@@citeR<#1>[#2]#3{%
    \if@filesw\immediate\write\@auxout{\string\citation{#3}}\fi%
    \edef\@citeP{}%
%    {\ignorespaces#1\space}%
    {\if#1\relax\else#1\ \fi}%
    \@for\@citeb:=#3\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}%
       \def\BCA##1##2{##1}}%
      {\def\BCA##1##2{##2}}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \ifx\@citeP\B@my@dummy%
        \if@F@cite\@F@citefalse\else{,\ }\fi%
	\csname Y@\@citeb\endcsname%
    \else%
        \if@F@cite\@F@citefalse\else{\BBC}\fi%
	\edef\@cite@undefined{?}%
	\ifx\@cite@undefined\B@my@dummy%
	  \csname Y@\@citeb\endcsname%
	\else%
	  \def\BBA{\BBAA}%
	  \csname b@\@citeb\endcsname\BBAY\csname Y@\@citeb\endcsname%
        \fi%
    \fi%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #2}}

%
% \citeA[postfix]{keys}
% \fullciteA[postfix]{keys}
% \shortciteA[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces Authors1 (Year1), ..., AuthorN (YearN, postfix)
%

\DeclareRobustCommand{\citeA}{\def\BCAY##1##2##3{\BCA{##1}{##2}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeA}%
                        {\def\@BBN{\ignorespaces}\@citeA[]}}

\DeclareRobustCommand{\fullciteA}{\def\BCAY##1##2##3{\BCA{##1}{##1}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeA}%
                        {\def\@BBN{\ignorespaces}\@citeA[]}}

\DeclareRobustCommand{\shortciteA}{\def\BCAY##1##2##3{\BCA{##2}{##2}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeA}%
                        {\def\@BBN{\ignorespaces}\@citeA[]}}

\def\@citeA[#1]#2{%
    \if@filesw\immediate\write\@auxout{\string\citation{#2}}\fi%
    \edef\@citeP{}%
    \@for\@citeb:=#2\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}%
       \def\BCA##1##2{##1}}%
      {\def\BCA##1##2{##2}}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \ifx\@citeP\B@my@dummy%
        \if@F@cite\@F@citefalse\else{,\ }\fi%
	\csname Y@\@citeb\endcsname%
    \else%
        \if@F@cite\@F@citefalse\else{\BBCP,\ }\fi%
        \def\BBA{\BBAB}%
	\csname b@\@citeb\endcsname\ \BBOP\csname Y@\@citeb\endcsname%
    \fi%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #1}\BBCP}

%
% \citeS[postfix]{keys}
% \fullciteS[postfix]{keys}
% \shortciteS[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces Authors1's (Year1), ..., AuthorN's (YearN, postfix)
%

\DeclareRobustCommand{\citeS}{\def\BCAY##1##2##3{\BCA{##1}{##2}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeS}%
                        {\def\@BBN{\ignorespaces}\@citeS[]}}

\DeclareRobustCommand{\fullciteS}{\def\BCAY##1##2##3{\BCA{##1}{##1}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeS}%
                        {\def\@BBN{\ignorespaces}\@citeS[]}}

\DeclareRobustCommand{\shortciteS}{\def\BCAY##1##2##3{\BCA{##2}{##2}}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeS}%
                        {\def\@BBN{\ignorespaces}\@citeS[]}}

\def\@citeS[#1]#2{%
    \if@filesw\immediate\write\@auxout{\string\citation{#2}}\fi%
    \edef\@citeP{}%
    \@for\@citeb:=#2\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}%
       \def\BCA##1##2{##1}}%
      {\def\BCA##1##2{##2}}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \ifx\@citeP\B@my@dummy%
        \if@F@cite\@F@citefalse\else{,\ }\fi%
	\csname Y@\@citeb\endcsname%
    \else%
        \if@F@cite\@F@citefalse\else{\BBCP,\ }\fi%
        \def\BBA{\BBAB}%
	\csname b@\@citeb\endcsname's\ \BBOP\csname Y@\@citeb\endcsname%
    \fi%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #1}\BBCP}

%
% \citeauthor{keys}
% \fullciteauthor{keys}
% \shortciteauthor{keys}
%	writes \citation{keys} on .aux
%	produces Authors1, ..., AuthorN
%

%\def\citeauthor{\def\BCAY##1##2##3{\BCA{##1}{##2}}\@citeauthor}
\DeclareRobustCommand{\citeauthor}{%
   \def\BCAY##1##2##3{\BCA{##1}{##2}}\@citeauthor}

\DeclareRobustCommand{\fullciteauthor}{%
   \def\BCAY##1##2##3{\BCA{##1}{##1}}\@citeauthor}

\DeclareRobustCommand{\shortciteauthor}{%
   \def\BCAY##1##2##3{\BCA{##2}{##2}}\@citeauthor}

\def\@citeauthor#1{%
    \if@filesw\immediate\write\@auxout{\string\citation{#1}}\fi%
    \edef\@citeP{}%
    \@for\@citeb:=#1\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}%
       \def\BCA##1##2{##1}}%
      {\def\BCA##1##2{##2}}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \ifx\@citeP\B@my@dummy%
    \else%
        \if@F@cite\@F@citefalse\else{,\ }\fi%
        \def\BBA{\BBAB}%
	\csname b@\@citeb\endcsname%\ \BBOP\csname Y@\@citeb\endcsname%
    \fi%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue}

%
% \citeyear[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces (Year1, ..., YearN, postfix)
%

\DeclareRobustCommand{\citeyear}{\def\BCAY##1##2##3{}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeyear}%
                        {\def\@BBN{\ignorespaces}\@citeyear[]}}

\def\@citeyear[#1]#2{%
    \if@filesw\immediate\write\@auxout{\string\citation{#2}}\fi%
    \edef\@citeP{}%
    \BBOP\@for\@citeb:=#2\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}}%
      {}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \if@F@cite\@F@citefalse\else{,\ }\fi%
    \csname Y@\@citeb\endcsname%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #1}\BBCP}

%
% \citeyearR[postfix]{keys}
%	writes \citation{keys} on .aux
%	produces Year1, ..., YearN, postfix
%       i.e., no parentheses
%

\DeclareRobustCommand{\citeyearR}{\def\BCAY##1##2##3{}%
           \@ifnextchar[{\def\@BBN{\BBN}\@citeyearR}%
                        {\def\@BBN{\ignorespaces}\@citeyearR[]}}

\def\@citeyearR[#1]#2{%
    \if@filesw\immediate\write\@auxout{\string\citation{#2}}\fi%
    \edef\@citeP{}%
    \@for\@citeb:=#2\do{%
    \@ifundefined{b@\@citeb}%
     {\expandafter\def\csname b@\@citeb\endcsname{?}%
      \expandafter\def\csname Y@\@citeb\endcsname{?}%
      \@warning{Citation `\@citeb' on page \thepage\space undefined.}%
     }%
     {\@ifundefined{flag@\@citeb}%
      {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}}%
      {}%
     }%
    \edef\B@my@dummy{\csname b@\@citeb\endcsname}%
    \if@F@cite\@F@citefalse\else{,\ }\fi%
    \csname Y@\@citeb\endcsname%
    \edef\@citeP{\csname b@\@citeb\endcsname}%
    }\@F@citetrue{\@BBN #1}}

%
% \nocite{keys}
%	writes \citation{keys} in the aux file
%

\DeclareRobustCommand{\nocite}[1]{\@bsphack%
    \if@filesw\immediate\write\@auxout{\string\citation{#1}}\fi%
    \@for\@citeb:=#1\do{%
    \@ifundefined{b@\@citeb}%
    {\edef\B@my@dummy{*}%
     \ifx\@citeb\B@my@dummy\else
     \@warning{Citation `\@citeb' on page \thepage\space undefined.}
    \fi}%
    {\global\expandafter\def\csname flag@\@citeb\endcsname{DUMMY}}}%
    \@esphack}

% No labels in the bibliography.
\def\@biblabel#1{}
\newskip{\bibleftmargin}
\bibleftmargin=2.5em
%
\def\refname{References}
\def\bibname{Bibliography}
%
\newskip\bibparsep
\bibparsep\z@
%
\def\thebibliography#1{%
     \@ifundefined{chapter}%
       {\section*{\refname}%
%        \@mkboth{\uppercase{\refname}}{\uppercase{\refname}}
        \@mkboth{\refname}{\refname}
        \addcontentsline{toc}{section}{\refname}}%
       {\chapter*{\bibname}%
%        \@mkboth{\uppercase{\bibname}}{\uppercase{\bibname}}
        \@mkboth{\bibname}{\bibname}
        \addcontentsline{toc}{chapter}{\bibname}}
     \list
     {\relax}{\labelsep=\z@
              \leftmargin=\bibleftmargin
	      \itemindent=-\bibleftmargin}\itemsep=\z@\advance\parskip\bibparsep
     \def\newblock{\hskip .11em plus .33em minus .07em}
     \sloppy\clubpenalty4000\@clubpenalty\clubpenalty\widowpenalty4000
%     \sfcode`\.=\@m\relax}
     \frenchspacing\relax}
\let\endthebibliography=\endlist

\endinput