อ้างอิง

• Krejčí, Z (1983). "A contribution to the problems of the pathogenesis and microbial etiology of cholelithiasis". Acta Universitatis Palackianae Olomucensis Facultatis Medicae. 104: 279–286. PMID 6222611. Unknown parameter |coauthors= ignored (|author= suggested) (help)
• Bowen, R. (November 23, 2001). "Secretion of Bile and the Role of Bile Acids In Digestion". สืบค้นเมื่อ 2007-07-17. Unknown parameter |source= ignored (help)
• Maton, Anthea (1993). Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall. ISBN 0-13-981176-1. Unknown parameter |coauthors= ignored (|author= suggested) (help)