1. Organization WH, editors. Vitamin and mineral requirements in human nutrition: report of a joint FAO/WHO expert consultation. Bangkok, Thailand: World Health Organization and Food and Agriculture Organization of the United Nations; 2004.
2. Shenkin A, Baines M, Fell GS, Lyon TDG. Vitamins and Trace Elements. In: Burtis CA, Ashwood ER, Bruns DE, editors. Tietz textbook of clinical chemistry and molecular diagnostics. St. Louis: Elsevier; 2012. p. 907–10.
3. Beulens JW, Booth SL, van den Heuvel EG, Stoecklin E, Baka A, Vermeer C. The role of menaquinones (vitamin K(2)) in human health. Br J Nutr. 2013;110(8):1357–68.
4. Usui Y, Tanimura H, Nishimura N, Kobayashi N, Okanoue T, Ozawa K. Vitamin K concentrations in the plasma and liver of surgical patients. Am J Clin Nutr. 1990;51(5):846–52.
5. Lipsky JJ. Nutritional sources of vitamin K. Mayo Clin Proc. 1994;69(5):462–6.