Drew, Clifford. <br/><br/>
Mental retardation :  a life cycle approach / 
Clifford Drew. 
 - 5th.ed. 
 - New York :  Macmillan,  c1992. 
 - 476 p. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0675213576 
<br/><br/><label>LC Class. No.: </label>HV 3004  / .D73