Riffenburgh, Beau & Bob Carroll (1989). "The Birth of Pro Football"(PDF). Coffin Corner. 11 (Annual). Professional Football Researchers Association: 1–30. Archived from the original(PDF) on November 27, 2010.
Van Atta, Robert (1980). "Latrobe, PA: Cradle of Pro Football"(PDF). Coffin Corner. 2 (Annual). Professional Football Researchers Association: 1–21. Archived from the original(PDF) on March 26, 2009.
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