1. Dietary reference intakes for vitamin a, vitamin K, arsenic, boron, chromium, copper, iodine, iron, manganese, molybdenum, nickel, silicon, vanadium, and zinc;Food and Nutrition Board,2001
2. NS-EN 14148:2003 foodstuffs - determination of vitamin K1 by HPLC. 1 (2003-09-10);Standardization, E. C. F,2003