Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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