APA
The International Union for Conservation of Nature, World Health Organization & World Wide Fund Nature. (1993). Guidelines on the conservation of medicinal plants. Gland, Switzerland: The International Union for Conservation of Nature and Natural Resources (IUNC), The World Health Organization (WHO), World Wide fund for Nature (WWF).
Chicago
The International Union for Conservation of Nature, World Health Organization and World Wide Fund Nature. 1993. Guidelines on the conservation of medicinal plants. Gland, Switzerland: The International Union for Conservation of Nature and Natural Resources (IUNC), The World Health Organization (WHO), World Wide fund for Nature (WWF).
Harvard
The International Union for Conservation of Nature, World Health Organization and World Wide Fund Nature. (1993). Guidelines on the conservation of medicinal plants. Gland, Switzerland: The International Union for Conservation of Nature and Natural Resources (IUNC), The World Health Organization (WHO), World Wide fund for Nature (WWF).
MLA
The International Union for Conservation of Nature, World Health Organization and World Wide Fund Nature. Guidelines on the conservation of medicinal plants. Gland, Switzerland: The International Union for Conservation of Nature and Natural Resources (IUNC), The World Health Organization (WHO), World Wide fund for Nature (WWF). 1993.