Cita APA (7a ed.)

Helliwell, J. F. (2002). How's life?: Combining individual and national variables to explain subjective well-being. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Helliwell, John F. How's Life?: Combining Individual and National Variables to Explain Subjective Well-being. Cambridge, MA: National Bureau of Economic Research, 2002.

Cita MLA (9a ed.)

Helliwell, John F. How's Life?: Combining Individual and National Variables to Explain Subjective Well-being. National Bureau of Economic Research, 2002.