1. A review of human carcinogens—Part E: tobacco, areca nut, alcohol, coal smoke, and salted fish;B Secretan;The Lancet Oncology,2009
2. Epidemiology of betel quid usage;PC Gupta;Annals of the Academy of Medicine, Singapore,2004
3. Global epidemiology of areca nut usage;PC Gupta;Addiction biology,2002
4. Ministry of Information. Encyclopedia Myanmar CD-ROM. 2005Myanmar.
5. Tobacco habits other than smoking; betel-quid and areca-nut chewing; and some related nitrosamines. Lyon, 23–30 October 1984;IARC monographs on the evaluation of the carcinogenic risk of chemicals to humans,1985