Kristján Kristjánsson. (2013). Virtues and Vices in Positive Psychology (1.). Cambridge University Press.
Chicago Style (17. basım) AtıfKristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
MLA (8th ed.) AtıfKristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
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