Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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