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Tohutoro APA (7th ed.)
Frey, B. S. (2008). Happiness: A revolution in economics. MIT Press.
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Tohutoru Kātū Chicago (17th ed.)
Frey, Bruno S. Happiness: A Revolution in Economics. Cambridge, Mass.: MIT Press, 2008.
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Tohutoro MLA (9th ed.)
Frey, Bruno S. Happiness: A Revolution in Economics. MIT Press, 2008.
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