Citazione Stile APA (7a Edizione)
Layard, R. (2011). Happiness: Lessons from a new science (fully revised and updated ed.). Penguin Books.
Citazione stile Chigago Style (17a edizione)
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. London: Penguin Books, 2011.
Citatione MLA (9a ed.)
Layard, Richard. Happiness: Lessons from a New Science. fully revised and updated ed. Penguin Books, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.