DISESSA A./ABELSON H, . (1986). TURTLE GEOMETRY THE COMPUTER AS A MEDIUM FOR EXPLORING MATHS. NULL: MIT P.
DISESSA A./ABELSON H, . 1986. TURTLE GEOMETRY THE COMPUTER AS A MEDIUM FOR EXPLORING MATHS. NULL: MIT P.
DISESSA A./ABELSON H, . TURTLE GEOMETRY THE COMPUTER AS A MEDIUM FOR EXPLORING MATHS. NULL: MIT P. 1986.