1. Zimbabwe national micronutrient survey: 1999;Ministry of Health and Child Welfare. Nutrition Unit,2001
2. Nutritional blindness: xerophthalmia and keratomalacia;Sommer,1982
3. Vitamin A deficiency. Health, survival and vision;Sommer,1996
4. Controlling vitamin A deficiency nutrition policy discussion paper No. 14. A report based on the ACC/SCN consultative group meeting on strategies for the control of vitamin A deficiency 28–30 July 1993;United Nations Administrative Committee on Coordination Subcommittee on Nutrition (ACC/SCN)
5. Food and Agriculture Organization of the United Nations and International Life Sciences Institute. Preventing micronutrient malnutrition a guide to food-based approaches - why policy makers should give priority to food-based strategies, 1997. Available from: http://www.fao.org/docrep/X0245E/x0245e01.htm#P38_2721 (cited 5 May 2011).