TY  - BOOK
AU  - Sober, Elliott
AU  - Wilson, David Sloan
TI  - Unto others: the evolution and psychology of unselfish behavior
SN  - 0674930460
U1  - ISSR 171.8 
PY  - 1998///
CY  - Cambridge,USA
PB  - Harvard University Press
KW  - Altruism
ER  -