Cita APA (7a ed.)

Hough, D. A. (1993). Telephone skills: Essential telephone english. Heinemann.

Cita Chicago Style (17a ed.)

Hough, David A. Telephone Skills: Essential Telephone English. Oxford: Heinemann, 1993.

Cita MLA (9a ed.)

Hough, David A. Telephone Skills: Essential Telephone English. Heinemann, 1993.