Knight, J., & Gunatilaka, R. (2009). Is Happiness Infectious? Department of Economics (University of Oxford).
Cita Chicago (17th ed.)Knight, J., i R. Gunatilaka. Is Happiness Infectious? Department of Economics (University of Oxford), 2009.
Cita MLA (9th ed.)Knight, J., i R. Gunatilaka. Is Happiness Infectious? Department of Economics (University of Oxford), 2009.
Atenció: Aquestes cites poden no estar 100% correctes.