By Paul Graham; Prentice Hall, 1995, ISBN 0133708756. Tutorial introduction of essential Lisp programming concepts, plus a convenient, up-to-date reference manual, for ANSI CL.

Collaborative project; goal: write for CL a work similar to O'Reilly Media's Perl Cookbook.

By David S. Touretzky; Benjamin-Cummings, 1989, ISBN 0805304924. Fine introduction for beginners; even one who never programmed before in any language will be able to use this book, yet covers all relevant topics thoroughly. Full version online, two formats.

By Paul Graham; Prentice Hall, 1993, ISBN 0130305529. Thorough study of advanced methods, with bottom-up programming as unifying theme. First full description of macros and their uses. Covers important topics related to bottom-up programming: functional programming, rapid prototyping, interactive development, embedded languages. Free download, PDF.

By Peter Norvig; Morgan Kaufmann, 1992, ISBN 1558601910. Overview of classical AI programming, valuable history lessons, basic introduction to Lisp, efficiency considerations.

By Peter Seibel; Apress, 2005, ISBN 1590592395. Focus: putting CL to practical use with example projects: spam filter, ID3 parser, Shoutcast server. Source code downloads. Full version online.