TY  - BOOK
AU  - Kernan Keith T Ed.
AU  -  Begab Michael J Ed.
AU  -  Edgerton Robert B Ed.
TI  - Environments and behavior :  The adaptation of mentally retarded persons.     
T2  - NICHD-Mental retardation research centers series
U1  - S62, M3 
PY  - 1983///
CY  - Baltimore
PB  - University Park Press     
ER  -