(1988). Vitamin A supplemnsts Aguide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia. World health organization.
Citazione stile Chigago Style (17a edizione)Vitamin A Supplemnsts Aguide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. Ginebra: World health organization, 1988.
Citatione MLA (9a ed.)Vitamin A Supplemnsts Aguide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. World health organization, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.