TY  - BOOK
AU  - Abolson, Harold and Disessa, Andrea A.
AU  - Disessa, Andrea A. ; jt. auth.
TI  - Turtle geometry; the computer as a medium for exploring mathematics
T2  - The MIT Press series in artificial intelligence
U1  - 516 
PY  - 1981///
CY  - Cambridge
PB  - MIT Press
ER  -