Ehlers, Walter H. <br/><br/>
An introduction to mental retardation  a programmed text 
Walter H. Ehlers, Curtis H. Krishef, Jon C. Prothero. 
 - 2d ed. 
 - Columbus, Ohio  Merrill  c1977. 
 - xv, 384 p. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0675085268 
<br/><br/><label>LCCN: </label>76049380 //r842 
<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.
<br/><br/><label>LC Class. No.: </label>RC570  / .E34 1977 
<br/><br/><label>Dewey Class. No.: </label>362.3/07/7