Roberts, R., & Hagen, D. (2014). How adam smith can change your life: An unexpected guide to human nature and happiness (Unabridged.). Your Coach Digital.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRoberts, Russ, और Don Hagen. How Adam Smith Can Change Your Life: An Unexpected Guide to Human Nature and Happiness. Unabridged. Rego Park: Your Coach Digital, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRoberts, Russ, और Don Hagen. How Adam Smith Can Change Your Life: An Unexpected Guide to Human Nature and Happiness. Unabridged. Your Coach Digital, 2014.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.