1. Hoffbrand AV, Moss PAH, Pettit JE. Erythropoiesis and general aspects of anaemia. Essential Haematology. Fifth ed. UK: Blackwell Publishing; 2006. p. 18–20.
2. Ciesla B. Red blood cell production, function, and relevant red cell morphology. Haematology in practice. Philadelphia: F. A. Davis Company; 2007. p. 37–46.
3. Dallman PR. Iron. In: Brown M, editor. Present knowledge in nutrition. Washington: Nutrition Foundation; 1990. p. 241–50.
4. World Health Organization. The world health report: reducing risks, promoting healthy life. Geneva: World Health Organization; 2002.
5. World Health Organization. Worldwide prevalence of anaemia 1993–2005. WHO Global Database on Anaemia. Geneva: WHO Press; 2008. p. 7–8.