Manning, C.D., and Schutze, H. (1999). Foundations of Statistical Natural Language Processing, MIT Press, Cambridge, MA. — see under books for a copy —
Jurafsky, D., and Martin, J.H., (2000, 2nd ed 2009). Speech and Language Processing, Prentice-HOtherall, Upper Saddle River, New Jersey.
Other helpful texts include
Charniak, E., (1993). Statistical Language Learning, MIT Press, Cambridge, MA.
Klavans, J.L., and Resnik, P., (1996). The Balancing Act: Combining Symbolic and Statistical Approaches to Language, MIT.
Bennett Jr., W. R., (1976). Scientific and engineering problem-solving with the computer, Prentice-Hall, Englewood Cliffs, New Jersey, Chapter 4, 103-199.
Many useful texts can also be downloaded from the “Books” menu.