Allen, D. (2015). Getting things done: How to achieve stress-free productivity (Revised and updated edition.). Piatkus Books.
Chicago Style (17th ed.) CitationAllen, David. Getting Things Done: How to Achieve Stress-free Productivity. Revised and updated edition. London: Piatkus Books, 2015.
MLA (9th ed.) CitationAllen, David. Getting Things Done: How to Achieve Stress-free Productivity. Revised and updated edition. Piatkus Books, 2015.
Warning: These citations may not always be 100% accurate.