APA (7th ed.) Citation

Gems, G. R., & Pfister, G. (2009). Understanding American sports. Routledge.

Chicago Style (17th ed.) Citation

Gems, Gerald R., and Gertrud Pfister. Understanding American Sports. London ; New York: Routledge, 2009.

MLA (9th ed.) Citation

Gems, Gerald R., and Gertrud Pfister. Understanding American Sports. Routledge, 2009.