1. Guidelines on food fortification with micronutrients;Allen,2006
2. Official Methods of Analysis of AOAC International (1996) Minerals in Ready to Feed Milk Based Infant Formula and Pet Foods (Atomic Absorption Spectrophotometric Method) Infant Formula and Medical Diets, 985.35: 50.1.14. 16th ed., Gaithersburg, MD, USA.
3. Official Methods of Analysis of AOAC International (1996) Calcium, Copper, Iron, Magnesium, Manganese, Phosphorus, Sodium and Zinc in Infant Formula. (Inductively Coupled Plasma Emission Spectroscopic Method). Infant Formula and Medical Diets 984.27: 50.1.15. 16th ed. Gaithersburg, MD, USA.
4. Milk and milk products. Determination of the iron content (Photometric reference method). International IDF Standard 103A:1986;International Dairy Federation,1986
5. Milk and milk products. Determination of zinc content (Flame Atomic Absorption spectrometric reference method). International IDF Standard 156A:2000;International Dairy Federation,2000