APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.