No Christian End!(PDF). The Journey to Camp: The Origins of American Football to 1889. Professional Football Researchers Association. [January 26, 2010]. (原始内容存档(PDF)于2017-09-11).
No Christian End!(PDF). The Journey to Camp: The Origins of American Football to 1889. Professional Football Researchers Association. [January 26, 2010]. (原始内容存档(PDF)于2017-09-11).