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Sachs, J. (2012). Chapter 1: Introduction. In J. F. Helliwell, R. Layard, & J. Sachs (Eds.), World happiness report (pp. 2-9). New York: The Earth Institute, Columbia University. http://www.earth.columbia.edu/sitefiles/file/Sachs%20Writing/2012/World%20Happiness%20Report.pdf

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