International Union for Conservation of Nature and Natural Resources. General Assembly. (1991). Resolutions and recommendations. IUCN.
Citação do estilo Chicago (17ª ed.)International Union for Conservation of Nature and Natural Resources. General Assembly. Resolutions and Recommendations. Gland, Switzerland: IUCN, 1991.
Citação MLA (8ª ed.)International Union for Conservation of Nature and Natural Resources. General Assembly. Resolutions and Recommendations. IUCN, 1991.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.