Cita APA (7th ed.)

Martin, W. B. (1993). Quality customer service (3rd ed.). Crisp Publications.

Cita Chicago (17th ed.)

Martin, William B. Quality Customer Service. 3rd ed. Menlo Park, Calif: Crisp Publications, 1993.

Cita MLA (9th ed.)

Martin, William B. Quality Customer Service. 3rd ed. Crisp Publications, 1993.