Wizard Book

n. Structure and Interpretation of Computer Programs (Hal Abelson, Jerry
Sussman and Julie Sussman; MIT Press, 1984, 1996; ISBN 0-262-01153-0), an
excellent computer science text used in introductory courses at MIT. So
called because of the wizard on the jacket. One of the bibles of the
LISP/Scheme world. Also, less commonly, known as the Purple Book. Now
available on the http://mitpress.mit.
