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britannica.com
"Patna". Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica Inc., 2013. Web. 13 Dec. 2013 <"Patna | India". Archived from the original on 30 November 2011. Retrieved 30 January 2011.>.
"Patna". Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica Inc., 2013. Web. 13 Dec. 2013 <"Patna | India". Archived from the original on 30 November 2011. Retrieved 30 January 2011.>.