De Jong J M, Berg J.M. <br/><br/>
Proceedings of the Seventh Congress on International Association for the Scientific Study of Mental Deficiency (1985 : New Delhi).  Science and service in mental retardation. 

 - 475p. 
<br/><br/><label>ISBN: </label>0-416-40650-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental retardation--Congresses