BOYDEN, EA. The accessory gallbladder-an embryological and comparative study of aberrant biliary vesicles occurring in man and domestic mammals. Am J Anast. 1926, 38, 177-231
HARLAFTIS, N. Multiple gallbladder. Surg Gynecol Obstet. 1977, 145, 928-934
GROSS, RE. Congenital anomalies of the gallbladder. A review of one hundred and forty-eight cases, with report of a double gallbladder. Arch Surg. 1936, 32, 131-162