APA aipamena

Knight, J., & Gunatilaka, R. (2009). Is Happiness Infectious? Department of Economics (University of Oxford).

Chicago Style aipamena

Knight, J., and R. Gunatilaka. Is Happiness Infectious? Department of Economics (University of Oxford), 2009.

MLA aipamena

Knight, J., and R. Gunatilaka. Is Happiness Infectious? Department of Economics (University of Oxford), 2009.

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