Mental retardation :  a book of readings / 
edited by Catherine A. Groff 
 - New York :  MSS Information Corporation,  1973 
 - 236 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0842203354 
<br/><br/><label>LCCN: </label>73-011194 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental retardation