Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

Layard, P. R. G. Happiness: Lessons from a New Science. New York: Penguin Press, 2005.

Citatione MLA (8a ed.)

Layard, P. R. G. Happiness: Lessons from a New Science. Penguin Press, 2005.