Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.