HOOKS I F. (2001). CUSTOMER CENTERED PRODUCTS. AMACOM.
Lua i Stíl Chicago (17ú heag.)HOOKS I F. CUSTOMER CENTERED PRODUCTS. NEW YORK: AMACOM, 2001.
Lua MLA (9ú heag.)HOOKS I F. CUSTOMER CENTERED PRODUCTS. AMACOM, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.