(1988). Vitamin A supplemnsts Aguide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia. World health organization.
Chicago-viite (17. p.)Vitamin A Supplemnsts Aguide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. Ginebra: World health organization, 1988.
MLA-viite (9. p.)Vitamin A Supplemnsts Aguide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. World health organization, 1988.
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