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Done: The Art of Stress-Free Productivity (2 ed.). Penguin Books. ISBN 9780143126560. Newport, Cal (November 17, 2020). "The Rise and Fall of Getting Things...

8, 2018. Allen, David (2001). Getting Things Done. Penguin. ISBN 978-0-14-312656-0. Forrest, Brady (October 21, 2006). "The Story of KGTD and OmniFocus"...

Stress-Free Productivity (revised ed.). New York: Penguin Books. ISBN 978-0-14-312656-0.[citation needed] Paul Keegan, June 21, 2007 How David Allen mastered...