Elaine K. Harris. Customer Service: A Practical Approach (5.). Pearson India.
Lua i Stíl Chicago (17ú heag.)Elaine K. Harris. Customer Service: A Practical Approach. 5. Pearson India.
Lua MLA (8ú heag.)Elaine K. Harris. Customer Service: A Practical Approach. 5. Pearson India.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.