Institute of Medicine, Food and Nutrition Board. Dietary Reference Intakes for Vitamins A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium and Zinc. Washington, DC: National Academy Press, 2001. Available from:
https://www.ncbi.nlm.nih.gov/books/NBK222310/
World Health Organization. Trace elements in human nutrition and health. 1996. Available from: http://www.who.int/nutrition/publications/micronutrients/9241561734/en/
Wada O. What are Trace Elements. JMAJ. 2004; 47(8): 351-358.
Aliasgharpour M, Rahnamaye FM. Elements in human nutrition: A review. 2013; 2(3): 115-128.
Braun L, Cohen M. Herbs and Natural Supplements: An evidence based guide. 4th Edition, Vol 2. Australia. Elsevier, 2015.