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usda.gov
nal.usda.gov
Howe, Juliette C.; Williams, Juhi R.; Holden, Joanne M. (March 2004). "USDA Database for the Choline Content of Common Foods"(PDF). United States Department of Agriculture (USDA): 10. Diarkibkan daripada yang asal(PDF) pada 2010-12-05. Dicapai pada 2014-05-24. Cite journal requires |journal= (bantuan)
web.archive.org
Howe, Juliette C.; Williams, Juhi R.; Holden, Joanne M. (March 2004). "USDA Database for the Choline Content of Common Foods"(PDF). United States Department of Agriculture (USDA): 10. Diarkibkan daripada yang asal(PDF) pada 2010-12-05. Dicapai pada 2014-05-24. Cite journal requires |journal= (bantuan)
wikipedia.org
en.wikipedia.org
Howe, Juliette C.; Williams, Juhi R.; Holden, Joanne M. (March 2004). "USDA Database for the Choline Content of Common Foods"(PDF). United States Department of Agriculture (USDA): 10. Diarkibkan daripada yang asal(PDF) pada 2010-12-05. Dicapai pada 2014-05-24. Cite journal requires |journal= (bantuan)