Cita APA (7th ed.)

Ludlow, R., & Panton, F. (1992). The essence of effective communication. Prentice Hall.

Cita Chicago (17th ed.)

Ludlow, Ron, i Fergus Panton. The Essence of Effective Communication. New York: Prentice Hall, 1992.

Cita MLA (9th ed.)

Ludlow, Ron, i Fergus Panton. The Essence of Effective Communication. Prentice Hall, 1992.