Allen, D. (2015). Getting Things Done The art of Stress Free Productivity. Piatkus.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAllen, David. Getting Things Done The Art of Stress Free Productivity. London: Piatkus, 2015.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAllen, David. Getting Things Done The Art of Stress Free Productivity. Piatkus, 2015.
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