Underhill, P. (2009). Why we Buy: The Science of Shopping. Simon & Schuster Paper Book.
Chicago-viite (17. p.)Underhill, Paco. Why We Buy: The Science of Shopping. Simon & Schuster Paper Book, 2009.
MLA-viite (9. p.)Underhill, Paco. Why We Buy: The Science of Shopping. Simon & Schuster Paper Book, 2009.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.