Michael McCaskey, Who Succeeded Halas as Bears' Leader, Dies, Chicago News
George S. Halas Biography
580 George Halas Photos & High Res Pictures - Getty Images
Michael McCaskey, who succeeded Halas as Bears' leader, dies - The Boston Globe
Illinois Alumni Magazine - Fall 2017 - PAPA BEAR
George Halas (aka Papa Bear) Founder of the Chicago Bears and the NFL
Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
George Stanley Halas Sr., nicknamed Papa Bear and Mr. Everything, was a player, coach, and owner involv…