Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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