Cita APA (7th ed.)
Frey, B. S. (2008). Happiness: A revolution in economics. MIT Press.
Cita Chicago (17th ed.)
Frey, Bruno S. Happiness: A Revolution in Economics. Cambridge, Mass.: MIT Press, 2008.
Cita MLA (9th ed.)
Frey, Bruno S. Happiness: A Revolution in Economics. MIT Press, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.