Zaltman, G. (2003). How Customers Think. Butterworth- Heinemann.
Lua i Stíl Chicago (17ú heag.)Zaltman, Gerald. How Customers Think. Burlington: Butterworth- Heinemann, 2003.
Lua MLA (9ú heag.)Zaltman, Gerald. How Customers Think. Butterworth- Heinemann, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.