Παραπομπή APA

Turk, C. A. (2007). Effective speaking: Communicating in speech.

Παραπομπή Chicago Style

Turk, Christopher; Author. Effective Speaking: Communicating in Speech. London, Spon Press, 2007.

Παραπομπή MLA

Turk, Christopher; Author. Effective Speaking: Communicating in Speech. 2007.