PERIODICALS
 
DeWeerdt, Sarah. �Blast Waves and Brain Damage� from Columns, The University of Washington Alumni Magazine. September 2010. Volume 30, number 3. Page 22.
 
Ventsias, Tom. �Protecting Troops from Brain Injuries� from Terp, The University of Maryland Alumni Magazine. Fall 2010. Volume 8, number 1. Page 15.
 
ONLINE SOURCES
 
Answers.com. Football Helmets � What are they made of? Reviewed: November 10, 2010. http://www.answers.com/topic/football-helmet
 
AONESAFETY.com. Industrial Safety Helmets Specifications, 2010. Reviewed: November 11, 2010. http://www.aonesafety.com/safety-helmets-hard-hats.htm
 
Bicycle Helmet Safety Institute. �A Buyer�s Guide to Bicycle Helmets.� July 26, 2010. Reviewed: November 14, 2010. http://www.bhsi.org/guide.htm
 
Bicycle Helmet Safety Institute. �Skateboard Helmets.� January 1, 2010. Reviewed: November 14, 2010. http://www.bhsi.org/skatepam.htm
 
Centers for Disease Control. �Take Concussions out of Play: Learn to Prevent, Recognize, and Respond to Concussions.� Reviewed: December 8, 2010. http://www.cdc.gov/Features/ProtectYoungAthletes/