Chipponi JX, Bleier JC, Santi MT, Rudman D (mai 1982). „Deficiencies of essential and conditionally essential nutrients”. The American Journal of Clinical Nutrition. 35 (5 Suppl): 1112–6. doi:10.1093/ajcn/35.5.1112. PMID6805293.
Carver, Jane (). „Conditionally essential nutrients: choline, inositol, taurine, arginine, glutamine and nucleotides”. În Thureen, Patti J; Hay, William W. Neonatal Nutrition and Metabolism. Cambridge, UK: Cambridge University Press. pp.299–311. doi:10.1017/CBO9780511544712.020. ISBN9780511544712.
Chipponi JX, Bleier JC, Santi MT, Rudman D (mai 1982). „Deficiencies of essential and conditionally essential nutrients”. The American Journal of Clinical Nutrition. 35 (5 Suppl): 1112–6. doi:10.1093/ajcn/35.5.1112. PMID6805293.