3. gallstones in common bile duct -- University of Michigan Health System
Common duct stones are stones in the common bile duct. Also, gallstones may move from the gallbladder into the common bile duct and become lodged in the duct. Some common duct stones result from infection in the bile duct or liver.
http://www.med.umich.edu/1libr/aha/aha_choledoc_crs.htm

4. Information on Gallstones, Causes, Symptoms, Diagnosis and Treatment by MedicineNet.com
The bile flows through the canals and into larger collecting ducts within the liver (the intrahepatic bile ducts) The bile then flows within the intrahepatic bile ducts out of the liver and into the extrahepatic bile ducts-first into the hepatic...
http://www.medicinenet.com/gallstones/article.htm

5. Gallstones
Once the gallbladder is removed, bile flows out of the liver through the hepatic ducts into the common bile duct and directly into the small intestine, instead of being stored in the gallbladder. Other ducts open into the common bile duct,...
http://digestive.niddk.nih.gov/ddiseases/pubs/gallstones/