Paul Keegan. How David Allen mastered getting things done. The management guru has learned to relax, go with the flow, and market his mysterious elixir of success(англ.). CNNMoney, Business 2.0 Magazine (21 ліпеня 2007). Праверана 22 снежня 2015.
Paul Keegan. How David Allen mastered getting things done. The management guru has learned to relax, go with the flow, and market his mysterious elixir of success(англ.). CNNMoney, Business 2.0 Magazine (21 ліпеня 2007). Праверана 22 снежня 2015.