1. AACC Method 86-06.01. American Association of Cereal Chemists (AACC) approved methods of analysis, 11th Edition, 2009, Cereals & Grains Association. AACC Method 86-06.01: analysis of vitamins A and E by high-performance liquid chromatography, St. Paul (MN).
2. Allen L, de Benoist B, Dary O, Hurrell R. 2006. Guidelines on food fortification with micronutrients. Geneva (Switzerland): World Health Organization, Food and Agricultural Organization of the United Nations; p. 1–376.
3. AOAC International. 1992a. Official methods of analysis of AOAC International (2008). Rockville (MD): AOAC International. Official Method 992.04: Vitamin A (retinol isomers) in milk and milk-based infant formula.
4. AOAC International. 1992b. Official methods of analysis of AOAC International (2005). Rockville (MD): AOAC International. Official Method 992.06: Vitamin A (retinol) in milk-based infant formula.
5. AOAC International. 2001. Official methods of analysis of AOAC International (2011), AOAC International, Rockville (MD, USA). Official Method 2001.13: Vitamin A (retinol) in foods.