Underhill, P. (2009). Why we Buy: The Science of Shopping. Simon & Schuster Paper Book.
Lua i Stíl Chicago (17ú heag.)Underhill, Paco. Why We Buy: The Science of Shopping. Simon & Schuster Paper Book, 2009.
Lua MLA (9ú heag.)Underhill, Paco. Why We Buy: The Science of Shopping. Simon & Schuster Paper Book, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.