APA

International Union for Conservation of Nature and Nature Resources, . (1991). Caring for the earth : a strategy for sustainable living. : Published in partnership by IUCN-the world Consevation Union, UNEP-United Nations Environment Progranne, WWF-World Wide Fund for Nature.

Chicago

International Union for Conservation of Nature and Nature Resources, . 1991. Caring for the earth : a strategy for sustainable living. : Published in partnership by IUCN-the world Consevation Union, UNEP-United Nations Environment Progranne, WWF-World Wide Fund for Nature.

Harvard

International Union for Conservation of Nature and Nature Resources, . (1991). Caring for the earth : a strategy for sustainable living. : Published in partnership by IUCN-the world Consevation Union, UNEP-United Nations Environment Progranne, WWF-World Wide Fund for Nature.

MLA

International Union for Conservation of Nature and Nature Resources, . Caring for the earth : a strategy for sustainable living. : Published in partnership by IUCN-the world Consevation Union, UNEP-United Nations Environment Progranne, WWF-World Wide Fund for Nature. 1991.