APA (7th ed.) Zitazioa

Peterson, R. (1997). Pigskin: The early years of pro football. Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Peterson, Robert. Pigskin: The Early Years of Pro Football. New York: Oxford University Press, 1997.

MLA (9th ed.) Zitazioa

Peterson, Robert. Pigskin: The Early Years of Pro Football. Oxford University Press, 1997.