Cita APA (7a ed.)

Nettle, D. (2005). Happiness: The science behind your smile. Oxford University Press.

Cita Chicago Style (17a ed.)

Nettle, Daniel. Happiness: The Science Behind Your Smile. Oxford, UK ; New York, N.Y.: Oxford University Press, 2005.

Cita MLA (8a ed.)

Nettle, Daniel. Happiness: The Science Behind Your Smile. Oxford University Press, 2005.