(en) Documentalistes de la chaîne History, « Who Invented Football? », (consulté le ) : « The game has ancient origins, but in the late 19th century, Walter Camp helped shape football—the American kind—into the sport we know today. »
(en) Jack Brimberg et William Hurley, « Strategic considerations in the coaching of North American football », International Journal of Sport Management and Marketing, vol. 1, no 3, , p. 279–287 (lire en ligne).
