APA (7th ed.) Citation
Thaler, R. H., & Sunstein, C. R. (2009). Nudge: Improving decisions about health, wealth and happiness (revised ed.). Penguin Books.
Chicago Style (17th ed.) Citation
Thaler, Richard H., and Cass R. Sunstein. Nudge: Improving Decisions About Health, Wealth and Happiness. revised ed. London: Penguin Books, 2009.
MLA (9th ed.) Citation
Thaler, Richard H., and Cass R. Sunstein. Nudge: Improving Decisions About Health, Wealth and Happiness. revised ed. Penguin Books, 2009.
Warning: These citations may not always be 100% accurate.