Allen, D. (2015). Getting things done: The art of stress-free productivity.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAllen, David. Getting Things Done: The Art of Stress-free Productivity. 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAllen, David. Getting Things Done: The Art of Stress-free Productivity. 2015.
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