TY  - BOOK
AU  - Helmstadter, G.C. 
TI  - Principles of psychological measurement
U1  - 152.8 HEL 
PY  - 1964///
CY  - New York
PB  - Appleton-Century-Crofts
KW  - Psychometrics
KW  - Psychological Tests
N1  - Includes index.
ER  -