1. Gopalan C, Ramasastri BV, Balasubramanian SC (1982) In: Nutritive value of Indian foods, ICAR, New Delhi, pp 41, 64–72.
2. Chandra RK, Au B (1981) Single nutrient deficiency and cell mediated immune response-III Vitamin A Nutrition Res 1: 181.
3. National Programme for Control of Blindness (1981) Report of national workshop. Directorate general of health-services, New Delhi, India.
4. Thylefors B (1985) Prevention of blindness, the current focus. WHO Chronicle 39(4): 150.
5. UNDP, Human Development Report (1992) FAO/WHO, Report on the World Nutrition Challange; UNICEF, Care and Child Nutrition. ACC/SCN, Report on the world Nutrition Situation and Update. WHO, Bulletin 70(2): World Health Statistics Quarterly, 38 (3).