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Institute of Medicine (2002). 〈Protein and Amino Acids〉. 《Dietary Reference Intakes for Energy, Carbohydrates, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids》. Washington, DC: The National Academies Press. 589–768쪽. doi:10.17226/10490. ISBN978-0-309-08525-0.
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Slominski A, Semak I, Pisarchik A, Sweatman T, Szczesniewski A, Wortsman J (2002). “Conversion of L-tryptophan to serotonin and melatonin in human melanoma cells”. 《FEBS Letters》 511 (1–3): 102–6. doi:10.1016/s0014-5793(01)03319-1. PMID11821057. S2CID7820568.
Bartoli, F; Misiak, B; Callovini, T; Cavaleri, D; Cioni, RM; Crocamo, C; Savitz, JB; Carrà, G (2020년 10월 19일). “The kynurenine pathway in bipolar disorder: a meta-analysis on the peripheral blood levels of tryptophan and related metabolites.”. 《Molecular Psychiatry》 26 (7): 3419–3429. doi:10.1038/s41380-020-00913-1. PMID33077852. S2CID224314102.
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Fernstrom JD (2012). “Effects and side effects associated with the non-nutritional use of tryptophan by humans”. 《The Journal of Nutrition》 142 (12): 2236S–2244S. doi:10.3945/jn.111.157065. PMID23077193.
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Kimura T, Bier DM, Taylor CL (December 2012). “Summary of workshop discussions on establishing upper limits for amino acids with specific attention to available data for the essential amino acids leucine and tryptophan”. 《The Journal of Nutrition》 142 (12): 2245S–2248S. doi:10.3945/jn.112.160846. PMID23077196.
Becker J, Wittmann C (2012). “Bio-based production of chemicals, materials and fuels -Corynebacterium glutamicum as versatile cell factory”. 《Current Opinion in Biotechnology》 23 (4): 631–40. doi:10.1016/j.copbio.2011.11.012. PMID22138494.
Conrado RJ, Varner JD, DeLisa MP (2008). “Engineering the spatial organization of metabolic enzymes: mimicking nature's synergy”. 《Current Opinion in Biotechnology》 19 (5): 492–9. doi:10.1016/j.copbio.2008.07.006. PMID18725290.
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Slominski A, Semak I, Pisarchik A, Sweatman T, Szczesniewski A, Wortsman J (2002). “Conversion of L-tryptophan to serotonin and melatonin in human melanoma cells”. 《FEBS Letters》 511 (1–3): 102–6. doi:10.1016/s0014-5793(01)03319-1. PMID11821057. S2CID7820568.
Bartoli, F; Misiak, B; Callovini, T; Cavaleri, D; Cioni, RM; Crocamo, C; Savitz, JB; Carrà, G (2020년 10월 19일). “The kynurenine pathway in bipolar disorder: a meta-analysis on the peripheral blood levels of tryptophan and related metabolites.”. 《Molecular Psychiatry》 26 (7): 3419–3429. doi:10.1038/s41380-020-00913-1. PMID33077852. S2CID224314102.
Rambali B, Van Andel I, Schenk E, Wolterink G, van de Werken G, Stevenson H, Vleeming W (2002). “[The contribution of cocoa additive to cigarette smoking addiction]”(PDF). 《RIVM》 (The National Institute for Public Health and the Environment (Netherlands)) (report 650270002/2002). 2005년 11월 8일에 원본 문서(PDF)에서 보존된 문서.
“Information Paper on L-tryptophan and 5-hydroxy-L-tryptophan”. FU. S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Nutritional Products, Labeling, and Dietary Supplements. 2001년 2월 1일. 2005년 2월 25일에 원본 문서에서 보존된 문서. 2012년 2월 8일에 확인함.