History of the Chicago Bears - Wikipedia
Logos and uniforms of the Chicago Bears - Wikipedia
History of the Chicago Bears - Wikipedia
Early history of American football - Wikiwand
Walter Payton, Biography & Facts
1919 Decatur Staleys season - Wikipedia
Chicago Bears - Wikipedia
Chicago Bears - Franchise Overview
NFL: How All 32 Teams Got Their Names, News, Scores, Highlights, Stats, and Rumors
NFL Countdown: American Professional Football Association is formed
Bears NFL franchise began in Decatur as the Staleys