1. National Cancer Registry Programme. Consolidated report of the population based cancer registries 1990–1996. Incidence and distribution of cancer. New Delhi: Indian Council of Medical Research. 2001: pp.52–3.( http://www.icmr.nic.in/ncrp/ncrp_p/cancer_reg.pdf )
2. Dixit VK, Singh S, Shukla VK. Aetiopathogenesis of carcinoma gall bladder. Trop Gastroenterol. 2001;22:103–6.
3. Crawford JM. The liver and the biliary tract: disorders of the gall bladder: gall stones (cholelithiasis). In: Cotran RS, Kumar V, Collins T, eds. Robbins Pathologic Basis of Disease, 6th ed. Saunders: Elsevier, pp. 893–4.
4. Fox JG, Dewhirst FE, Shen Z, Feng Y, Taylor NS, Paster BJ. Hepatic Helicobacter species identified in bile and gall bladder tissue from Chileans with chronic cholecystitis. Gastroenterology. 1998;114:755–63.
5. Rudi J, Rudy A, Maiwald M, Stremmel W. Helicobacter sp. are not detectable in bile from German patients with biliary disease. Gastroenterology. 1999;116:1016–7.