1. Nutritional anaemias. Report of a WHO scientific group;Blanc;WHO Technical Report Series,1968
2. World Health Organization Technical Report Series: Iron deficiency anaemia, 1959 No. 182. P4 http://apps.who.int/iris/handle/10665/40447
3. Recommendations for haemoglobinometry in human blood;International Committee for Standardisation in Haematology;British Journal of Haematology,1967
4. Iron deficiency anaemia;Lopez;Lancet,2016
5. WHO Serum ferritin concentrations for the assessment of iron status and iron deficiency in populations Geneva World Health Organization 2011 http://www.who.int/vmins/indicators/serum_ferritin.pdf