Harris, R. (2008). The happiness trap: How to stop struggling and start living. Trumpeter.
Citazione stile Chigago Style (17a edizione)Harris, Russ. The Happiness Trap: How to Stop Struggling and Start Living. Boston: Trumpeter, 2008.
Citatione MLA (9a ed.)Harris, Russ. The Happiness Trap: How to Stop Struggling and Start Living. Trumpeter, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.