ABELSON, HAROLD; DISESSA, ANDREA — Turtle Geometry : The Computer As a Medium for Exploring Mathematics (Artificial Intelligence Ser. )
Cambridge, MA, U.S.A. MIT Press. 1981. (ISBN: 0-262-01063-1). Hard Cover. Publisher: MIT Press, 1982, V.Good, HB, ISBN: 0-262-01063-1. Very Good.
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