Imdad, A., Ahmed, Z., Bhutta, Z.A. (2016). Vitamin A supplementation for the prevention of morbidity and mortality in infants one to six months of age. Cochrane Database of Systematic Reviews, Issue 9. Art. No.: CD007480.
National Institute of Health [NIH]. (2016). Vitamin A: Fact sheet for healthcare professionals. Retrieved from https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
United Nations Children Fund [UNICEF]. (2013). Improving child nutrition: The achievable imperative for global progress. Retrieved from https://www.unicef.org/media/files/nutrition_report_2013.pdf