TY  - BOOK
AU  - HELMSTADTER, G. C
TI  - Research concepts in human behaviour: Education, psychology, sociology 
SN  - 0137740832
U1  - 300 HEL 
PY  - 1970///
CY  - New Jersey
PB  - Prentice - Hall
N1  - include bibliographical references and index
ER  -