TY  - BOOK
AU  - Ellis, Norman R.,
TI  - Handbook of mental deficiency: psychological theory and research 
T2  - McGraw-Hill series in psychology
U1  - 132.2 
PY  - 1963///
CY  - New York
PB  - McGraw-Hill
KW  - Mental retardation
N1  - Includes bibliographies and index
ER  -