Vitamin K Medical Encyclopedia: Vitamin K DHHS. NIH. NLM. MedlinePlus. MedlinePlus: Vitamin K DHHS. NIH. National Library of Medicine. Vitamin K Oregon State University. Linus Pauling Institute. Micronutrient Information Center. Vitamin K Deficiency Merck Manual of Diagnosis and Therapy. Vitamin K: Another Reason To Eat Your Greens USDA. Agricultural Research Service. Vitamin K: Interactions with Coumadin (PDF | 39 KB) DHHS. NIH. Warren Grant Magnuson Clinical Center.
DHHS. NIH. NLM. MedlinePlus.
DHHS. NIH. National Library of Medicine.
Oregon State University. Linus Pauling Institute. Micronutrient Information Center.
Merck Manual of Diagnosis and Therapy.
USDA. Agricultural Research Service.
DHHS. NIH. Warren Grant Magnuson Clinical Center.