Hiebeler, R. (1998). Best Practices: Building your business with customer - focused solutions. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Hiebeler, Robert. Best Practices: Building Your Business with Customer - Focused Solutions. Simon & Schuster, 1998.
Lua MLA (9ú heag.)Hiebeler, Robert. Best Practices: Building Your Business with Customer - Focused Solutions. Simon & Schuster, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.