1. Berger J. Intervention and persistence in small populations of bighorn sheep. Conserv Biol. 1999;13(2):432–5.
2. Bleisch B, Xuan Canh, L, Covert B et al. The IUCN red list of threatened species e. T22045A9351127; 2008.
3. Frankel OH, Soulé ME. Conservation and evolution. Cambridge: CUP Archive; 1981.
4. Gilpin ME, Soulé ME. Minimum viable populations: processes of species extinction. Conservation biology: the science of scarcity and diversity. Sunderland, MA: Sinauer Associates; 1986. p. 19–34.
5. Guerrant EO Jr. Genetic and demographic considerations in the sampling and reintroduction of rare plants. In: Conservation biology. New York. NY: Springer; 1992. p. 321–44.