APA (7th ed.) Citation

Thaler, R. H., & Sunstein, C. R. (2009). Nudge: Improving decisions about health, wealth and happiness (Ed. rev. and expanded.). Penguin Books.

Chicago Style (17th ed.) Citation

Thaler, Richard H., and Cass R. Sunstein. Nudge: Improving Decisions About Health, Wealth and Happiness. Ed. rev. and expanded. London: Penguin Books, 2009.

MLA (9th ed.) Citation

Thaler, Richard H., and Cass R. Sunstein. Nudge: Improving Decisions About Health, Wealth and Happiness. Ed. rev. and expanded. Penguin Books, 2009.