TY  - BOOK
AU  - Derlega,Valerian J.
AU  - Grzelak,Janusz
TI  - Cooperation and helping behavior: theories and research 
SN  - 0122108205
AV  - BF637.H4 C66 1982
U1  - 158/.2 19
PY  - 1982///
CY  - New York
PB  - Academic Press
KW  - Helping behavior
KW  - Cooperativeness
KW  - Altruism
KW  - Cooperative behavior
N1  - Includes bibliographies and indexes
ER  -