NAKAMURATakashi; SATOKatsuyuki; AKIBAMitsuo; OHNISHIMasao (2006). “Urobilinogen, as a Bile Pigment Metabolite, Has an Antioxidant Function”. Journal of Oleo Science (日本油化学会) 55 (4): 191-197. doi:10.5650/jos.55.191. NAID130000055572.
family-health-information.com
“Urobilinogen”. Family Health Information. 2008年3月30日閲覧。
NAKAMURATakashi; SATOKatsuyuki; AKIBAMitsuo; OHNISHIMasao (2006). “Urobilinogen, as a Bile Pigment Metabolite, Has an Antioxidant Function”. Journal of Oleo Science (日本油化学会) 55 (4): 191-197. doi:10.5650/jos.55.191. NAID130000055572.
swmed.edu
pathcuric1.swmed.edu
Normal Reference Range Table from The University of Texas Southwestern Medical Center at Dallas. Used in Interactive Case Study Companion to Pathologic basis of disease.