APA (7th ed.) Citation

Underhill, P. (2009). Why we buy: The science of shopping (Updated and revised.). Simon & Schuster.

Chicago Style (17th ed.) Citation

Underhill, Paco. Why We Buy: The Science of Shopping. Updated and revised. New York: Simon & Schuster, 2009.

MLA (9th ed.) Citation

Underhill, Paco. Why We Buy: The Science of Shopping. Updated and revised. Simon & Schuster, 2009.