1. Aldrovandi, U. (1599–1603). Ornithologia hoc est de avibus historiae Libri XII, Bologna, Italy, Vol. II (1600).
2. Buchanan, F. C., Adams, L. J., Littlejohn, R. P., Maddox, J. F., and Crawford, A. M. (1994). Determination of evolutionary relationships among sheep breeds using microsatellites. Genomics 22:397–403.
3. Carter, G. F. (1971). Pre-Columbian chickens in America. In Riley, C. L., Kelley, J. C., Pennington, C. W., and Rands, R. L. (eds.), Man Across the Sea: Problems of Pre-Columbian Contacts, Austin: University of Texas Press, pp. 78–218.
4. Cavender, N. D. (2001). Genetic variation of big bluestem (Andropogon gerardii) and its association with arbuscular mycorrhizal fungi; Implications for prairie restoration and reintroduction, PhD Thesis, Ohio State University, Columbus.
5. CENESTA (2003). Pastoral life in Iran—a changing landscape. Seedling, Jan. 2003, Genetic Resources Action International (GRAIN), Barcelona, pp. 17–21.