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2. Breslow, J. M. (2013, January 29). Obama's concerns focus Super Bowl talk on player safety.PBS-Frontline.Retrieved on from http://www.pbs.org/wgbh/pages/frontline/sports/concussion-watch/obamas-concerns-focus-super-bowl-talk-on-player-safety
3. Concussion watch. (2012).PBS-Frontline.Retrieved from http://www.pbs.org/wgbh/pages/frontline/concussion-watch
4. Farrar, D. (2012, May 8). Kurt Warner stands his ground on NFL concerns, answers his critics.Yahoo! Sports.Retrieved from http://sports.yahoo.com/blogs/nfl-shutdown-corner/kurt-warner-stands-ground-nfl-concerns-answers-critics-132130467.html
5. Chronic Traumatic Encephalopathy: A Potential Late Effect of Sport-Related Concussive and Subconcussive Head Trauma