TY  - BOOK
T1  - Understanding children's play,
DA  - 1952.
CY  - New York,
AU  - Hartley, Ruth E.
CN  - BF717
CN  - BF717
PB  - Columbia University Press,
PP  - New York,
PY  - 1952.
ID  - 81741
KW  - Play
KW  - Child development.
KW  - Child psychology.
TI  - Understanding children's play,
ER  -