-       Chapters on vitamins and minerals. By Ross et al. (2013) In Modern Nutrition in Health and Disease.

-       Reference Values for Food Energy and Nutrients for the United Kingdom. Department of Health. COMA. Report on Health and Social Subjects. 1991

-       Bates B, Cox L, Nicholson S et al (2016) National Diet and Nutrition Survey Rolling Programme (NDNS RP) Results from Years 5 and 6 (combined) of the Rolling Programme (2012/2013 – 2013/2014) The Stationery Office. London.

-       https://www.nutrition.org.uk/nutritionscience/nutrients-food-and-ingredients/minerals-and-trace-elements.html?limit=1&start=12

-       Whitehead, R., 1991. Dietary Reference Values For Food Energy And Nutrients For The United Kingdom. 3rd ed. London: H.M.S.O.

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