(en) Ying J, Rahbar MH, Hallman DM, Hernandez LM, Spitz MR, Forman MR, et al. Associations between dietary intake of choline and betaine and lung cancer risk. PLoS ONE. Public Library of Science; 2013;8(2):e54561. DOI:10.1371/journal.pone.0054561. PMID23383301. Dit is een open access artikel, beschikbaar onder de licentie Creative Commons Naamsvermelding (CC BY).
(en) Institute of Medicine Food Nutrition Board. Dietary reference intakes for thiamin, riboflavin, niacin, vitamin b6, folate, vitamin b12, pantothenic acid, biotin, and choline. Washington DC: The National Academies Press; 1998. 592 p. Gratis volledige rapport: https://www.nap.edu/openbook.php?isbn=0309065542.
(en) Ying J, Rahbar MH, Hallman DM, Hernandez LM, Spitz MR, Forman MR, et al. Associations between dietary intake of choline and betaine and lung cancer risk. PLoS ONE. Public Library of Science; 2013;8(2):e54561. DOI:10.1371/journal.pone.0054561. PMID23383301. Dit is een open access artikel, beschikbaar onder de licentie Creative Commons Naamsvermelding (CC BY).