(en) Tom Friend, « Kermit's Song », sur ESPN.com, ESPN (consulté le )
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(en) United States Congress House Committee on the Judiciary Subcommittee on Monopolies and Commercial Law, Rights of Professional Athletes : Hearing Before the Subcommittee on Monopolies and Commercial Law of the Committee on the Judiciary, House of Representatives, Ninety-fourth Congress, First Session on H.R. 2355 and H.R. 694 ... October 14, 1975, U.S. Government Printing Office, (lire en ligne), p. 20
(en) Danny Jones, Lost Treasures from the Golden Era of America's Game : Pro Football's Forgotten Heroes and Legends of the 50'S, 60'S, and 70'S, AuthorHouse, (ISBN978-1-4567-1685-1, lire en ligne), p. 1