TY  - BOOK
AU  - Helmstadter,G.C
TI  - Research concepts in human behavior: education, psychology, sociology
SN  - 0390434728
PY  - 1970///
CY  - Appleton-Century-Crofts : New York
KW  - Social sciences
KW  - Research
N1  - Bibliography: p. 415-427
ER  -