World Health Organization & World Health Organization. (1998). Regulatory Situation of Herbal Medicines. World Health organization.
Citazione stile Chigago Style (17a edizione)World Health Organization e World Health Organization. Regulatory Situation of Herbal Medicines. Geneva: World Health organization, 1998.
Citatione MLA (8a ed.)World Health Organization e World Health Organization. Regulatory Situation of Herbal Medicines. World Health organization, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.