Cita APA (7a ed.)

Barker, A. (2010). Improve your communication skills (2nd ed.). KoganPage.

Cita Chicago Style (17a ed.)

Barker, Alan. Improve Your Communication Skills. 2nd ed. London ; Philadelphia, PA: KoganPage, 2010.

Cita MLA (9a ed.)

Barker, Alan. Improve Your Communication Skills. 2nd ed. KoganPage, 2010.