APA Style

Organization, W, H. (1988). Vitamin a Supplements : a Guide to their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia . Geneva: World Health Organization.

MLA Style

Organization, World, Health. "Vitamin a Supplements : a Guide to their Use in the Treatment and Prevention of Vitamin A Deficiency and Xerophthalmia". Geneva: World Health Organization, 1988. print.