Cita APA (7a ed.)

Layard, R. (2005). Happiness: Lessons from a new science. Penguin.

Cita Chicago Style (17a ed.)

Layard, Richard. Happiness: Lessons from a New Science. New York: Penguin, 2005.

Cita MLA (9a ed.)

Layard, Richard. Happiness: Lessons from a New Science. Penguin, 2005.