New York Giants History - Big Blue Interactive
NFL History: 100 objects that tell the story of football - Sports Illustrated
Haynesworth again skips Redskins conditioning test - The San Diego Union- Tribune
Haynesworth again skips Redskins conditioning test - The San Diego Union- Tribune
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
Jimmy Graham back with Saints after he was stopped by police during 'medical episode,' team says - The San Diego Union-Tribune
Calaméo - Buckeye Sports Bulletin November 2, 2013
EXPLAINER: NFL using helmet caps for player safety, research
Chiefs using every angle to get ready for Manning - The San Diego Union- Tribune
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
The ESPN Daily podcast -- How to listen, episode guide and more - ESPN
Concussions in American football - Wikipedia
EXPLAINER: NFL using helmet caps for player safety, research
Madden NFL 10' to cover Polamalu, Fitzgerald - The San Diego Union-Tribune