Kristján Kristjánsson. (2013). Virtues and Vices in Positive Psychology (1.). Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.