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by: American Associatin of Mental Retardatio · Whit Edwards · Ruth A. LuckassonHardcover 
 
 
 details (Italy). details (Spain - España). 
 ISBN: 978-0-940898-81-3 ISBN-10: 0-940898-81-0  | 
| See also (possibly by other authors): | ||
| 1992 | Paperback | Mental Retardation: Definition, Classification, and Systems of Supports |