Gaya APA

Thaler, R, H., Sunstein, C, R. (2009). Nudge : Improving Decisions About Helath, Wealth and Happiness . New York: Penguin Books.

Gaya MLA

Thaler, Richard, H., Sunstein, Cass, R.. "Nudge : Improving Decisions About Helath, Wealth and Happiness". New York: Penguin Books, 2009. Text.