Porter, M. E. (1985). Competitive advantage. New York: The Free Press.
Trích dẫn kiểu ChicagoPorter, Michael E. Competitive Advantage. New York: The Free Press, 1985.
MLA引文Porter, Michael E. Competitive Advantage. New York: The Free Press, 1985.
警告：這些引文格式不一定是100％准確.