1. Anderson, S., 1998. Sustainable rural livelihoods and animal genetic resources. Invited keynote paper at the Ibero–American Congress on Creole and Indigenous Breeds, Tamaulipas, Mexico.
2. Artuso, A., 1996. Creating linkages between valuation, conservation and sustainable development of genetic resources. Paper prepared for the Symposium on the Economics of Valuation and Conservation of Genetic Resources for Agriculture, Centre for International Studies on Economic Growth, Tor Vergata University, Rome, 13–15 May.
3. Bulmer, M.G., 1980. The Mathematical Theory of Quantitative Genetics. Clarendon Press, Oxford.
4. A model for valuing endangered species;Brown;J. Environ. Econ. Manag.,1984
5. Brown, K, Pearce, D., Perrings, C., Swanson, T., 1993. Economics and the conservation of global diversity. Working Paper Number 2. Global Environmental Facility. Washington DC.