APA

World Congress on National Parks and Protected Areas, World Conservation Monitoring Centre [Switzerland] & Internationl Union for Conservation of Nature and Nature Resources. (1992). Protected areas of the world. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources.

Chicago

World Congress on National Parks and Protected Areas, World Conservation Monitoring Centre [Switzerland] and Internationl Union for Conservation of Nature and Nature Resources. 1992. Protected areas of the world. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources.

Harvard

World Congress on National Parks and Protected Areas, World Conservation Monitoring Centre [Switzerland] and Internationl Union for Conservation of Nature and Nature Resources. (1992). Protected areas of the world. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources.

MLA

World Congress on National Parks and Protected Areas, World Conservation Monitoring Centre [Switzerland] and Internationl Union for Conservation of Nature and Nature Resources. Protected areas of the world. Gland, Switzerland: International Union for Conservation of Nature and Natural Resources. 1992.