International Vitamin A Consultative Group, UNICEF, WHO/UNICEF/IVACG Task Force, & World Health Organization. (1997). Vitamin A supplements: A guide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia (2nd ed.). World Health Organization.
Chicago-referens (17:e uppl.)International Vitamin A Consultative Group, UNICEF, WHO/UNICEF/IVACG Task Force, och World Health Organization. Vitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd ed. Geneva: World Health Organization, 1997.
MLA-referens (9:e uppl.)International Vitamin A Consultative Group, et al. Vitamin A Supplements: A Guide to Their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia. 2nd ed. World Health Organization, 1997.