Dyfyniad APA

Allen, D. (2015). Getting Things Done The art of Stress Free Productivity. Piatkus.

Dyfyniad Arddull Chicago

Allen, David. Getting Things Done The Art of Stress Free Productivity. London: Piatkus, 2015.

Dyfyniad MLA

Allen, David. Getting Things Done The Art of Stress Free Productivity. Piatkus, 2015.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.