Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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