APA aipamena

PORTER MICHAEL E. (1985). COMPETITIVE ADVANTAGE: CREATING AND SUSTAINING SUPERIOR... FREE PRESS.

Chicago Style aipamena

PORTER MICHAEL E. COMPETITIVE ADVANTAGE: CREATING AND SUSTAINING SUPERIOR... NEW YORK: FREE PRESS, 1985.

MLA aipamena

PORTER MICHAEL E. COMPETITIVE ADVANTAGE: CREATING AND SUSTAINING SUPERIOR... FREE PRESS, 1985.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.