1. Betel nut: a common drug used by naturalized citizens from India, Far East Asia, and the South Pacific Islands;Nelson;Ann Emerg Med,1999
2. Role of areca nut consumption in the cause of oral cancers. A cytogenetic assessment;Dave;Cancer,1992
3. Paan http://en.wikipedia.org/wiki/Paan.html
4. Paan http://www.tradeindia.com/about_products/1344/Pan-Masala.html
5. Paan http://www.theoriginof.com/paan.html