http://web.ebscohost.com/chc/detail?vid=3&hid=104&sid=cb7a4d29-eba5-4a20-a445-d798e6b1caa1%40sessionmgr115&bdata=JnNpdGU9Y2hjLWxpdmU%3d#db=cmh&AN=HL11942

http://www.neurosurgery.pitt.edu/trauma/concussion.html

http://m.reporternews.com/news/2011/dec/12/girls-have-more-headaches-after-concussion/

http://www.webhealthanswers.com/youth-football-injury-frequency-and-severity-on-the-rise.html

http://www.wisportsconcussion.org/prevention.html

http://www.brainline.org/landing_pages/categories/concussion.html

http://kidshealth.org/teen/safety/first_aid/concussions.html

http://web.ebscohost.com/chc/detail?vid=6&hid=106&sid=bc246c71-6457-49f8-a097-b234d141fb41%40sessionmgr11&bdata=JnNpdGU9Y2hjLWxpdmU%3d#db=cmh&AN=26705688



http://www.post-gazette.com/pg/12034/1207802-66-0.stm


http://www.hughston.com/hha/a_12_2_3.htm

http://www.post-gazette.com/pg/12043/1209684-66.stm

http://sports.espn.go.com/ncaa/recruiting/football/news/story?id=4392045

http://sportsillustrated.cnn.com/2012/writers/ben_glicksman/01/27/concussions.gupta.qanda/index.html