1. Vitamin B12
2. R. R.Eitenmiller and W. O.Landen, Jr, in Vitamin Analysis for the Health and Food Sciences, CRC Press, Taylor & Francis Group, Boca Raton, FL, USA, 1999, pp. 507–534
3. E.Somer, in The Essential guide to Vitamins and Minerals, Harper Collins Publishers, New York, 1992, pp. 61–64
4. Institute of Medicine, Food and Nutrition Board, Vitamin B12 in Dietary Reference Intakes for Thiamine, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin and Choline, National Academy Press, Washington DC, 1998, ch. 9, p. 306
5. Determination of vitamin B12 in multivitamin tablets by multimode high-performance liquid chromatography