Abelson, Harold <br/><br/>
Turtle geometry  the computer as a medium for exploring mathematics 
Harold Abelson, Andrea A. diSessa 
 - Cambridge, Mass.  MIT Press  1980 
 - 477p. 24cm 
 - The MIT Press series in artificial intelligence .
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0262010631 
<br/><br/><label>LCCN: </label>80-25620 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry--Study and teaching<br/>Computer-assisted instruction