APA
The World Health Organization (WHO), . (1993). Guidelines on the conservation of medicinal plants. : WHO, IUCN, WWF.
Chicago
The World Health Organization (WHO), . 1993. Guidelines on the conservation of medicinal plants. : WHO, IUCN, WWF.
Harvard
The World Health Organization (WHO), . (1993). Guidelines on the conservation of medicinal plants. : WHO, IUCN, WWF.
MLA
The World Health Organization (WHO), . Guidelines on the conservation of medicinal plants. : WHO, IUCN, WWF. 1993.
