Cita APA (7a ed.)
Layard, R., & Ward, G. Can We Be Happier?: Evidence and Ethics. Penguin.
Cita estilo Chicago (17a ed.)
Layard, Richard, y George Ward. Can We Be Happier?: Evidence and Ethics. Londres, Inglaterra: Penguin.
Cita MLA (9a ed.)
Layard, Richard, y George Ward. Can We Be Happier?: Evidence and Ethics. Penguin.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.