APA

International Union for Conservation of Nature and Natural Resources. General Assembly, . (1972). Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources. Morges, Switzerland: IUCN.

Chicago

International Union for Conservation of Nature and Natural Resources. General Assembly, . 1972. Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources. Morges, Switzerland: IUCN.

Harvard

International Union for Conservation of Nature and Natural Resources. General Assembly, . (1972). Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources. Morges, Switzerland: IUCN.

MLA

International Union for Conservation of Nature and Natural Resources. General Assembly, . Eleventh General Assembly [of the] International Union for Conservation of Nature and Natural Resources. Morges, Switzerland: IUCN. 1972.