1. Hoefs, J. 2004. Stable Isotope Geochemistry, 5th Edition. Springer-Verlag, New York.
2. Peterson, B.J. and B. Fry. 1987. Stable isotopes in ecosystem studies. Annual Review of Ecology and Systematics 18:293-320.
3. Balesdent, J., C. Girardin, and A. Mariotti. 1993. Site-related δ13C of tree leaves and soil organic matter in a temperate forest. Ecology 74:1713-1721.
4. DeNiro, M.J. and S. Epstein. 1976. You are what you eat (plus a few ‰): The carbon isotope cycle in food chains. Geological Society of America Abstracts Program 8:834-835.
5. Ehleringer, J.R. and T.E. Cerling. 2001. C3 and C4 photosynthesis. In H.A. Mooney and J. Canadell (eds.), Encyclopedia of Global Environmental Change, Volume II, John Wiley and Sons, New York, pp. 186-190.