International review of research in mental retardation / 
Edited by Norman R. Ellis and Norman W. Bray. 
 - Orlando, Fla. :  Academic Press,  1984. 
 - v. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0123662125 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental retardation.