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  • Helliwell, J. F., Layard, R., & Sachs, J. (Eds.). (2016). World Happiness Report 2016 Update (Vol. I). New York: Sustainable Development Solutions Network. (xsd:string)
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  • Helliwell, J., Layard, R., Sachs, J. (2016). World Happiness Report 2016 Update. New York: Sustainable Development Solutions Network. N. Y.: Sustainable Development Solutions Network. (xsd:string)
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