TY  - BOOK
AU  - Boyd, Robert
AU  - Silk, Joan B.
TI  - How humans evolved
SN  - 9780393912272
U1  - 599.938 
PY  - 1997///
CY  - New York
PB  - W.W.Norton & Company
KW  - Human evolution
N1  - Appendix : A40
ER  -