Smith, I. (2010). Happy: Simple steps to get the most out of life. St. Martin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmith, Ian. Happy: Simple Steps to Get the Most Out of Life. New York: St. Martin's Press, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSmith, Ian. Happy: Simple Steps to Get the Most Out of Life. St. Martin's Press, 2010.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.