Não informado. (1961). IUCN bulletin. International Union for Conservation of Nature and Natural Resources.
Style de citation Chicago (17e éd.)Não informado. IUCN Bulletin. Morges, Suíça: International Union for Conservation of Nature and Natural Resources, 1961.
Style de citation MLA (8e éd.)Não informado. IUCN Bulletin. International Union for Conservation of Nature and Natural Resources, 1961.
Attention : ces citations peuvent ne pas être correctes à 100%.