Mental retardation / 
James R. Patton, Mary Beirne-Smith, James S. Payne 
 - 3rd ed. 
 - New York :  MacMillan,  1989 
 - 634 p. :  ill. ;  24 cm. 
<br/><br/><label>LCCN: </label>89-061335 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental deficiency