Cita APA (7th ed.)

Michael E.Porter. (1998). Competitive Strategy (NA.). A Division of Simon & Schuster, Inc.

Cita Chicago (17th ed.)

Michael E.Porter. Competitive Strategy. NA. New York: A Division of Simon & Schuster, Inc, 1998.

Cita MLA (9th ed.)

Michael E.Porter. Competitive Strategy. NA. A Division of Simon & Schuster, Inc, 1998.