Stewart, M. (1998). Football: A History of the Gridiron Game. Franklin Watts.
Lua i Stíl Chicago (17ú heag.)Stewart, Mark. Football: A History of the Gridiron Game. Franklin Watts, 1998.
Lua MLA (8ú heag.)Stewart, Mark. Football: A History of the Gridiron Game. Franklin Watts, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.