Kristján Kristjánsson. (2013). Virtues and Vices in Positive Psychology (1.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Kristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
Lua MLA (8ú heag.)Kristján Kristjánsson. Virtues and Vices in Positive Psychology. 1. Cambridge University Press, 2013.
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