Citazione Stile APA (7a Edizione)

Helliwell, J. F., Layard, R., & Sachs, J. (2013). World happiness report 2013. Sustainable Development Solutions Network.

Citazione stile Chigago Style (17a edizione)

Helliwell, John F., Richard Layard, e Jeffrey Sachs. World Happiness Report 2013. New York, N. Y: Sustainable Development Solutions Network, 2013.

Citatione MLA (9a ed.)

Helliwell, John F., et al. World Happiness Report 2013. Sustainable Development Solutions Network, 2013.