TY  - BOOK
AU  - Zigler, Edward
AU  - Hodapp, Robert M
TI  - Understanding mental retardation
SN  - 9780521318785
SN  - 85031444
U1  - 616.8588 ZIG 
PY  - 1986///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Mental retardation
N1  - Includes indexes. Bibliography: p. 248-279
ER  -