Ehlers, Walter H. <br/><br/>
Mental retardation and other developmental disabilities  a programmed introduction 
Walter H. Ehlers, Jon C. Prothero, John Langone. 
 - 3rd ed. 
 - Columbus  C.E. Merrill Pub. Co.  c1982. 
 - xi, 502 p. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0675098165 (pbk.) 
<br/><br/><label>LCCN: </label>81084798 //r84 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental Retardation--Programmed instruction.<br/>Mentally handicapped children--Services for--Programmed instruction.--United States<br/>Developmental disabilities--Programmed instruction.