World Health Organization. (1989). WORLD health organization: : publications catalogue 1948- 1989. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. WORLD Health Organization: : Publications Catalogue 1948- 1989. World Health Organization, 1989.
Citatione MLA (9a ed.)World Health Organization. WORLD Health Organization: : Publications Catalogue 1948- 1989. World Health Organization, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.