Required (available at the MIT Coop,  and through Quantum books):

Jurafsky, D. and Martin, J.H., Speech and Language Processing,        PrenticeHall: 2000.  ISBN: 0130950696

Recommended & Reference Readings (all on library reserve):

Manning/Schuetze cover small Manning, C. D. and H. Schütze: Foundations of Statistical Natural Language Processing. The MIT Press. 1999. ISBN 0-262-13360-1.

Barton, E., Berwick, R., & Ristad, E.. Computational Complexity and Natural Language: The MIT Press. 1987. ISBN 0-26-02266-4. (Sorry no real cover picture available.)
Allen cover small Allen, J.: Natural Language Understanding. The Benajmins/Cummings Publishing Company Inc. 1994. ISBN 0-8053-0334-0.
Brady, J & Berwick, R.: Computational Models of Discourse. The MIT Press, 1983. ISBN-0-262-02183-8 .
Charniak cover small Charniak, E.: Statistical Language Learning. The MIT Press. 1996. ISBN 0-262-53141-0.