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Another classic reference is Common Lisp: The Language by Guy Steele (Digital Press, 1984 and 1990). The first edition, a.k.a. CLtL1, was the de facto standard for the language for a number of years. While waiting for the official ANSI standard to be finished, Guy Steele--who was on the ANSI committee--decided to release a second edition to bridge the gap between CLtL1 and the eventual standard. The second edition, now known as CLtL2, is essentially a snapshot of the work of the standardization committee taken at a particular moment in time near to, but not quite at, the end of the standardization process. Consequently, CLtL2 differs from the standard in ways that make it not a very good day-to-day reference. It is, however, a useful historical document, particularly because it includes documentation of some features that were dropped from the standard before it was finished as well as commentary that isn't part of the standard about why certain features are the way they are.
