World Health Organization, International Union for Conservation of Nature and Natural Resources, & World Wide Fund for Nature. (1993). Guidelines on the conservation of medicinal plants. World Health Organization : World Conservation Union : World Wide Fund for Nature.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Health Organization, International Union for Conservation of Nature and Natural Resources, και World Wide Fund for Nature. Guidelines on the Conservation of Medicinal Plants. Gland, Switzerland: World Health Organization : World Conservation Union : World Wide Fund for Nature, 1993.
Παραπομπή σε μορφή MLA (8th εκδ.)World Health Organization, et al. Guidelines on the Conservation of Medicinal Plants. World Health Organization : World Conservation Union : World Wide Fund for Nature, 1993.
