Cita APA (7th ed.)

Zikmund, W. G., & D'Amico, M. (1995). Effective marketing: Creating and keeping customers. West.

Cita Chicago (17th ed.)

Zikmund, William G., i Michael D'Amico. Effective Marketing: Creating and Keeping Customers. Minneapolis: West, 1995.

Cita MLA (9th ed.)

Zikmund, William G., i Michael D'Amico. Effective Marketing: Creating and Keeping Customers. West, 1995.