Tohutoro APA (7th ed.)
Layard, R., & Ward, G. Can We Be Happier?: Evidence and Ethics. Penguin.
Tohutoru Kātū Chicago (17th ed.)
Layard, Richard, me George Ward. Can We Be Happier?: Evidence and Ethics. Londres, Inglaterra: Penguin.
Tohutoro MLA (9th ed.)
Layard, Richard, me George Ward. Can We Be Happier?: Evidence and Ethics. Penguin.
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