Cancer Research UK. (2014, February 12). Statistics and Outlook for Cancer of the Anus. Retrieved from: http://www.cancerresearchuk.org/about-cancer/type/anal-cancer/treatment/statistics-and-outlook-for-cancer-of-the-anus.
Statistics Canada, Health Statistics Division. (2012, January 17). Cancer Survival Statistics 1992 to 2003. Ottawa, ON: Statistics Canada. Retrieved from: http://www.statcan.gc.ca/pub/82-226-x/82-226-x2012001-eng.htm.
Surveillance Epidemiology and End Results (SEER), National Cancer Institute. (2014, November). SEER Stat Fact Sheets: Anal Cancer. Bethesda, MD: National Cancer Institute. Accessed May 4, 2015. Retrieved from: http://seer.cancer.gov/statfacts/html/anus.html.×