Gaya APA
Layard, Richard. (2005).
Happiness: Lessons from a New Science .
London:
Penguin Books.
Gaya Chicago
Layard, Richard.
Happiness: Lessons from a New Science.
London:
Penguin Books,
2005.
Text.
Gaya MLA
Layard, Richard.
Happiness: Lessons from a New Science.
London:
Penguin Books,
2005.
Text.
Gaya Turabian
Layard, Richard.
Happiness: Lessons from a New Science.
London:
Penguin Books,
2005.
Print.