The Jargon File (version 4.4.7, 29 Dec 2003):

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.edu/sicp/


The Free On-line Dictionary of Computing (30 December 2018):

Wizard Book

    Hal Abelson, Gerald Sussman and Julie
   Sussman's "Structure and Interpretation of Computer Programs"
   (MIT Press, 1984; ISBN 0-262-01077-1), 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.

   [Jargon File]

   (1995-01-10)