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Herbert V (setembro de 1988). "Vitamin B-12: plant sources, requirements, and assay". The American Journal of Clinical Nutrition48 (3 Suppl): 852–8. PMID3046314. doi:10.1093/ajcn/48.3.852.
Watanabe F, Abe K, Fujita T, Goto M, Hiemori M, Nakano Y (xaneiro de 1998). "Effects of Microwave Heating on the Loss of Vitamin B(12) in Foods". Journal of Agricultural and Food Chemistry46 (1): 206–210. PMID10554220. doi:10.1021/jf970670x.