TY  - BOOK
AU  - Piaget,Jean
TI  - Main trends in psychology
SN  - 0061317802
PY  - 1973///
CY  - New York
PB  - Harper Torchbooks
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  -