Dietary reference intakes for thiamin, riboflavin, niacin, vitamin B⁶ , folate, vitamin B¹2, pantothenic acid, biotin, and choline
a report of the Standing Committee on the Scientific Evaluation of Dietary Reference Intakes and its Panel on Folate, Other B Vitamins, and Choline and Subcommittee on Upper Reference Levels of Nutrients, Food and Nutrition Board, Institute of Medicine
Bok Engelsk 1998