Hegyi J, Schwartz RA, Hegyi V (ianuarie 2004). „Pellagra: dermatitis, dementia, and diarrhea”. International Journal of Dermatology. 43 (1): 1–5. doi:10.1111/j.1365-4632.2004.01959.x. PMID14693013.
Hegyi J, Schwartz RA, Hegyi V (ianuarie 2004). „Pellagra: dermatitis, dementia, and diarrhea”. International Journal of Dermatology. 43 (1): 1–5. doi:10.1111/j.1365-4632.2004.01959.x. PMID14693013.
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„Niacin”. Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, OR. . Accesat în .