TY  - BOOK
AU  - Hartley,Ruth E.
AU  - Frank,Lawrence K.
AU  - Goldenson,RobertM.
TI  - Understanding children's play
U1  - 136.7479 
PY  - 1952///
CY  - New York
PB  - Columbia University Press
KW  - Play
KW  - Psychological aspects
KW  - Child psychology
N1  - Includes bibliographical references and index
ER  -