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.