Cognitive and motivational aspects of instruction :  XXIInd International Congress of Psychology Leipzig GDR July 6-12, 1980 / 
edited by Robert Glaser and Joachim Lompscher 
 - Amsterdam :  North-Holland,  1982 
 - 189 p. :  ill, ;  24 cm. 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>0444863516 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational psychology