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oregonstate.edu
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"Choline". Micronutrient Information Center, Linus Pauling Institute, Oregon State University. February 2015. Retrieved 11 November 2019.
"Choline chloride"(PDF). Screening Information Data Set (SIDS) for High Production Volume Chemicals. IPCS INCHEM. Archived from the original(PDF) on 2017-07-12. Retrieved 2009-11-10.