Gupta, Sanjay. "Fit to Lead." CNN. Special Investigations Unit. Broadcast 2008 October 11. Note: I have some questions about bias in this source. They claimed that Senator McCain's temple melanoma was the size of a dime and the thickness of a nickel. It was actually larger then a penny (which is larger than a dime) and thicker than a nickel. In addition, they devoted much air time to Senator Obama's smoking history, without once mentioning that Senator McCain smoked two packs of cigarettes per day for about 25 years.
Nordlund, James J. "Premature canities." Page 659 in: Nordlund JJ, et al (eds). The Pigmentary System. 2nd ed. Malden, MA: Blackwell Pub., 2006. (ISBN 9781405120340 @ Amazom.com)
Presidential Debate #2 of 2008. October 7, 2008.
Reuters. Sen. McCain to Undergo Surgery for Skin Cancer. 2002 Feb. 4.
Safire, William. "The Operating Room." New York Times. 1987 January 5, page 17. As quoted in: Abrams, Herbert L. "The President Has Been Shot": Confusion, Disability, and the 25th Amendment in the Aftermath of the Assassination of President Ronald Reagan. New York: WW Norton, 1992. Page 231. (ISBN 0-393-03042-3 @ Amazon.com)