Cita APA (7th ed.)

Cohen, W. A. (2005). The marketing plan (4th ed.). Wiley.

Cita Chicago (17th ed.)

Cohen, William A. The Marketing Plan. 4th ed. Hoboken, NJ: Wiley, 2005.

Cita MLA (9th ed.)

Cohen, William A. The Marketing Plan. 4th ed. Wiley, 2005.