Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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