Book
Conserving The World's Biological Diversity. Gland, Switzerland and Washington, DC: International Union for Conservation of Nature and Natural Resources; World Resources Institute; Conservation International; World Wildlife Fund-US; World Bank. http://www.worldcat.org/oclc/21193600.
. 1990. Global Biodiversity Strategy: Policy-Makers' Guide. [Washington, DC]: World Resources Institute. http://www.worldcat.org/oclc/221361601.
. 1992.