World Health Organization. (2011). Quality control methods for herbal materials. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Quality Control Methods for Herbal Materials. Geneva: World Health Organization, 2011.
Citatione MLA (9a ed.)World Health Organization. Quality Control Methods for Herbal Materials. World Health Organization, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.