APA (7th ed.) Citation
Layard, R. (2011). Happiness: Lessons from a new science (fully revised and updated ed.). Penguin Books.
Chicago Style (17th ed.) Citation
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. London: Penguin Books, 2011.
MLA (9th ed.) Citation
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. Penguin Books, 2011.
Warning: These citations may not always be 100% accurate.