There are many good textbooks on LISP - the following is a very brief selection.
CHARNIAK, E. and McDERMOTT, D. (1985)
Artificial Intelligence,
Addison-Wesley. (QZ 1240 Cha).
A general AI textbook. Chapter 2 contains some useful LISP exercises.
DEAN, T., ALLEN, J. and ALOIMONOS, Y. (1995)
Artificial Intelligence: Theory And Practice,
Benjamin/Cummins Publishing Co.
A modern AI textbook, good on current practical applications of the subject.
HUGHES, S. (1986)
LISP,
Pitman, Computer Handbooks series.
A short snappy guide to Common LISP. Cheap, but goes into quite a lot of
detail.
STEELE, G. L. (1984)
Common LISP: The language,
Digital Press. (QE 1155 Lis).
This is the original definition of the language - only for the brave.
WINSTON, P. H. and HORN, B. K. P. (1984) LISP, Addison-Wesley. (QZ 1240 Win). A textbook on Common LISP - may be useful if you decide to learn the language fairly thoroughly.