APA
World Health Organization, . (2003). WHO guidelines on good agricultural and collection practices (GACP) for medicinal plants. World Health Organization, Geneva: .
Chicago
World Health Organization, . 2003. WHO guidelines on good agricultural and collection practices (GACP) for medicinal plants. World Health Organization, Geneva: .
Harvard
World Health Organization, . (2003). WHO guidelines on good agricultural and collection practices (GACP) for medicinal plants. World Health Organization, Geneva: .
MLA
World Health Organization, . WHO guidelines on good agricultural and collection practices (GACP) for medicinal plants. World Health Organization, Geneva: . 2003.