Steel, P. (2011). The procrastination equation: How to stop putting things off and start getting stuff done (1st U.S. ed.). Harper.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSteel, Piers. The Procrastination Equation: How to Stop Putting Things off and Start Getting Stuff Done. 1st U.S. ed. New York: Harper, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSteel, Piers. The Procrastination Equation: How to Stop Putting Things off and Start Getting Stuff Done. 1st U.S. ed. Harper, 2011.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.