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![Cover for Robert Biswas-Diener · At lykkes: En invitation til positiv psykologi (Taschenbuch) [1. Ausgabe] [Paperback] (2014)](https://imusic.b-cdn.net/images/item/original/076/9788792542076.jpg?robert-biswas-diener-2014-at-lykkes-en-invitation-til-positiv-psykologi-taschenbuch&class=scaled&v=1337032822)
![Cover for Robert Biswas-diener · Positive Psychology as Social Change (Taschenbuch) [1st ed. 2011 edition] (2011)](https://imusic.b-cdn.net/images/item/original/719/9789400723719.jpg?robert-biswas-diener-2011-positive-psychology-as-social-change-taschenbuch&class=scaled&v=1443964946)
![Cover for Robert Biswas-diener · Positive Psychology as Social Change (Gebundenes Buch) [2011 edition] (2010)](https://imusic.b-cdn.net/images/item/original/372/9789048199372.jpg?robert-biswas-diener-2010-positive-psychology-as-social-change-gebundenes-buch&class=scaled&v=1443964946)