APA (7th ed.) Citation
Allen David. Getting Things Done: The Art of Stress-Free Productivity. Little, Brown Book Group Limited.
Chicago Style (17th ed.) Citation
Allen David. Getting Things Done: The Art of Stress-Free Productivity. London: Little, Brown Book Group Limited.
MLA (9th ed.) Citation
Allen David. Getting Things Done: The Art of Stress-Free Productivity. Little, Brown Book Group Limited.
Warning: These citations may not always be 100% accurate.