Underhill, P. (2000). Why We Buy. Penguin Group.
Lua i Stíl Chicago (17ú heag.)Underhill, Paco. Why We Buy. New Delhi: Penguin Group, 2000.
Lua MLA (9ú heag.)Underhill, Paco. Why We Buy. Penguin Group, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.