Dyfyniad APA

Barker, A. (2013). Improve your communication skills (Third Edition.). Philadelphia, PA: Kogan Page Ltd.

Dyfyniad Arddull Chicago

Barker, Alan. Improve Your Communication Skills. Third Edition. Philadelphia, PA: Kogan Page Ltd, 2013.

Dyfyniad MLA

Barker, Alan. Improve Your Communication Skills. Third Edition. Philadelphia, PA: Kogan Page Ltd, 2013.

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