1920 Decatur Staleys season - Wikipedia
Chicago Bears: Take a look back at a century of uniforms
History of the Chicago Bears, American Football Database
Bears NFL franchise began in Decatur as the Staleys
NFL's humble beginnings, Other Sports
George Halas – Society for American Baseball Research
Chicago Bears NFL franchise began in Decatur as the Staleys
After 75 years, Bears' 73-0 title win still stands in record
Chicago Bears, History & Notable Players
George Halas — Father of the NFL - Big Blue View
How Did The Bears Get The Name Monsters Of The Midway?