Cita APA (7a ed.)
Layard, R. (2011). Happiness: Lessons from a new science (fully revised and updated ed.). Penguin Books.
Cita Chicago Style (17a ed.)
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. London: Penguin Books, 2011.
Cita MLA (9a ed.)
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. Penguin Books, 2011.
Precaución: Estas citas no son 100% exactas.