International Union for Conservation of Nature and Natural Resources. General Assembly. (1991). Resolutions and recommendations. IUCN.
芝加哥风格引文International Union for Conservation of Nature and Natural Resources. General Assembly. Resolutions and Recommendations. Gland, Switzerland: IUCN, 1991.
MLA引文International Union for Conservation of Nature and Natural Resources. General Assembly. Resolutions and Recommendations. IUCN, 1991.
警告：这些引文格式不一定是100％准确.