APA (7th ed.) Zitazioa
Porter, M. E. (1986). Competition in global industries. Harvard Business school.
Chicago Style (17th ed.) Zitazioa
Porter, Michael E. Competition in Global Industries. Boston: Harvard Business school, 1986.
MLA (9th ed.) Zitazioa
Porter, Michael E. Competition in Global Industries. Harvard Business school, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.