World Conservation Monitoring Centre. (1992). Protected areas of the world: A review of national systems. International Union for Conservation of Nature and Natural Resources.
Chicago-referens (17:e uppl.)World Conservation Monitoring Centre. Protected Areas of the World: A Review of National Systems. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources, 1992.
MLA-referens (9:e uppl.)World Conservation Monitoring Centre. Protected Areas of the World: A Review of National Systems. International Union for Conservation of Nature and Natural Resources, 1992.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.