APA (7th ed.) Zitazioa

Porter, M. E. (1998). On competition. Harvard Businesss School Publishing.

Chicago Style (17th ed.) Zitazioa

Porter, Michael E. On Competition. Boston: Harvard Businesss School Publishing, 1998.

MLA (9th ed.) Zitazioa

Porter, Michael E. On Competition. Harvard Businesss School Publishing, 1998.