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.
Chicagoスタイル(17版)引用形式International Union for Conservation of Nature and Natural Resources , International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. Morges, Switzerland: International Union for Conservation of Nature and Natural Resources, 1961.
MLA(8版)引用形式International Union for Conservation of Nature and Natural Resources , International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. International Union for Conservation of Nature and Natural Resources, 1961.