TY  - BOOK
AU  - Ridley, Matt
AU  - Ridley,Matt
TI  - Origins of Virtue:  Human Instincts and the Evolution of Cooperation
U1  - 303.5 
PY  - 1996///
CY  - New Delhi, India 
PB  - Penguin Books 
KW  - Evolution
N1  - includes index and biblioraphy; notes, index
ER  -