Cita APA (7a ed.)

Comfort, J., & Utley, D. (1996). Effective telephoning. Oxford university press.

Cita Chicago Style (17a ed.)

Comfort, Jeremy, y Derek Utley. Effective Telephoning. Oxford: Oxford university press, 1996.

Cita MLA (8a ed.)

Comfort, Jeremy, y Derek Utley. Effective Telephoning. Oxford university press, 1996.