Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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