TY  - BOOK
AU  - Piaget,Jean
TI  - Main trends in psychology
T2  - Main trends in the social sciences,
SN  - 0041500423
AV  - BF38.5 .P5
U1  - 150 
PY  - 1973///
CY  - London
PB  - Allen and Unwin
KW  - Psychology
KW  - Methodology
KW  - Research
N1  - "Originally published as chapter 3 in Main trends of research in the social and human sciences, Part 1, Mouton/Unesco 1970."; Includes bibliographical references and index
ER  -