APA
World Health Organization, . (1999). WHO monographs on selected medicinal plants : vol. I. auth., Geneva: .
Chicago
World Health Organization, . 1999. WHO monographs on selected medicinal plants : vol. I. auth., Geneva: .
Harvard
World Health Organization, . (1999). WHO monographs on selected medicinal plants : vol. I. auth., Geneva: .
MLA
World Health Organization, . WHO monographs on selected medicinal plants : vol. I. auth., Geneva: . 1999.