Wenger,Etienne <br/><br/>
Artificial intelligence and tutoring sysyems  computational and cognitive approac 
Etienne Wenger 
 - Los Altos  Morgan Kaufmann  1987 
 - xxiii,486p 
<br/><br/><label>ISBN: </label>0934613266 
<br/><br/><label>Dewey Class. No.: </label>006.3 W485A