Cita APA (7th ed.)

Walker, G. (2009). Modern competitive strategy (Third edition.). McGraw-Hill/Irwin.

Cita Chicago (17th ed.)

Walker, Gordon. Modern Competitive Strategy. Third edition. New York: McGraw-Hill/Irwin, 2009.

Cita MLA (9th ed.)

Walker, Gordon. Modern Competitive Strategy. Third edition. McGraw-Hill/Irwin, 2009.