Underhill, P. (2000). Why We Buy. Penguin Group.
Chicago Style aipamenaUnderhill, Paco. Why We Buy. New Delhi: Penguin Group, 2000.
MLA aipamenaUnderhill, Paco. Why We Buy. Penguin Group, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.