References
- Bartholomew , G.A. Jr. and Birdsell , J.B. 1953 . Ecology and the protohominids . Am. Anthropol , 55 : 481 – 498 .
- Demment , M.W. 1983 . Feeding ecology and the evolution of body size of baboons . African J. Ecol , 21 : 219 – 233 .
- Heizer , R.F. and Graham , J.A. 1967 . A Guide to Field Methods in Archaeology , 141 – 147 . Palo Alto : The National Press . Chapter 11
- Katzenberg , M.A. , Saunders , S.B. and Fitzgerald , W.R. 1993 . Age differences in stable carbon and nitrogen isotope ratios in a population of prehistoric maize horticulturalists . Am. J. Phys. Anthropol , 90 : 267 – 281 .
- Schwarcz , H.P. and Schoeninger , M.J. 1991 . Stable isotope analyses in human nutritional ecology . Yearbook Phys. Anthropol. , 34 : 283 – 321 .
- van Soest , P.J. 1982 . Nutritional Ecology of the Ruminant , Corvallis : O & B Books .
- Peter S. Rodman