APA (7th ed.) Citation

International Union for Conservation of Nature and Natural Resources, World Wide Fund for Nature, & United Nations Environment Programme. (1991). Caring for the earth. IUCN-the World Conservation Union ; United Nations Environment Programme : World Wide Fund for Nature.

Chicago Style (17th ed.) Citation

International Union for Conservation of Nature and Natural Resources, World Wide Fund for Nature, and United Nations Environment Programme. Caring for the Earth. Gland, Switzerland: IUCN-the World Conservation Union ; United Nations Environment Programme : World Wide Fund for Nature, 1991.

MLA (9th ed.) Citation

International Union for Conservation of Nature and Natural Resources, et al. Caring for the Earth. IUCN-the World Conservation Union ; United Nations Environment Programme : World Wide Fund for Nature, 1991.