Peterson, R. (1997). Pigskin: The early years of pro football. Oxford University Press.
Chicagoスタイル(17版)引用形式Peterson, Robert. Pigskin: The Early Years of Pro Football. New York: Oxford University Press, 1997.
MLA(9版)引用形式Peterson, Robert. Pigskin: The Early Years of Pro Football. Oxford University Press, 1997.
警告: この引用は必ずしも正確ではありません.