12574 Robert Chassell: Programming in Emacs Lisp. 1995. 1-882114-41-8. $20. Perhaps out of print. But on the web. Glickstein: Writing GNU Emacs extensions - make your own editor through Lisp and customizable features. O'Reilly 1997, 250p. 1-56592-261-1. DM 59. Bil Lewis/Dan La Liberte/Richard Stallman: GNU Emacs Lisp reference manual. Internet 1998, 820p. William McEnaney: Programming techniques in Emacs. Prima 2000, 400p. DM 87.