APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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