Underhill, P. (1999). Why we buy: The science of shopping. Simon & Schuster.
Chicago Style aipamenaUnderhill, Paco. Why We Buy: The Science of Shopping. New York: Simon & Schuster, 1999.
MLA aipamenaUnderhill, Paco. Why We Buy: The Science of Shopping. Simon & Schuster, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.