APA (7th ed.) Zitazioa

Keddy, P. A. (1989). Competition. Chapman and Hall.

Chicago Style (17th ed.) Zitazioa

Keddy, Paul A. Competition. London, United Kingdom: Chapman and Hall, 1989.

MLA (9th ed.) Zitazioa

Keddy, Paul A. Competition. Chapman and Hall, 1989.