Dyfyniad APA

Porter, M. E. (2004). Competitive Advantage: Creating and Sustaining Superior Performance. Free Press.

Dyfyniad Arddull Chicago

Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. New York: Free Press, 2004.

Dyfyniad MLA

Porter, Michael E. Competitive Advantage: Creating and Sustaining Superior Performance. Free Press, 2004.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.