International Union for Conservation of Nature and Natural Resources & International Union for Conservation of Nature and Natural Resources. (1961). IUCN bulletin. International Union for Conservation of Nature and Natural Resources.
Citace podle Chicago (17th ed.)International Union for Conservation of Nature and Natural Resources a International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. Morges, Switzerland: International Union for Conservation of Nature and Natural Resources, 1961.
Citace podle MLA (8th ed.)International Union for Conservation of Nature and Natural Resources a International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. International Union for Conservation of Nature and Natural Resources, 1961.
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