TY  - BOOK
AU  -  Ehlers Walter H., Krishef Curtis H., Prothero Jon C.
TI  - Introduction to mental retardation: a programmed text
U1  - WM300 
PY  - 1973///
CY  - Columbus
PB  - Charles E. Merrill Publishing
KW  - Mental Retardation
N2  -  Mental Retardation
ER  -