World Health Organization. (1998). Guidelines for the appropriate use of herbal medicines. World Health organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Guidelines for the Appropriate Use of Herbal Medicines. Manila: World Health organization, 1998.
Citatione MLA (8a ed.)World Health Organization. Guidelines for the Appropriate Use of Herbal Medicines. World Health organization, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.