Παραπομπή APA

Barker, A. (2008). Improve your communication skills (2nd ed.). Kogan Page.

Παραπομπή Chicago Style

Barker, Alan. Improve Your Communication Skills. 2nd ed. New Delhi: Kogan Page, 2008.

Παραπομπή MLA

Barker, Alan. Improve Your Communication Skills. 2nd ed. Kogan Page, 2008.