Gaya APA
Tschohl, J. (2003).
Achieving Excellence Through Costumer Service Unggul Bersaing Melalui Layanan Pelangggan .
Jakarta:
Gramedia pustaka.
Gaya MLA
Tschohl, John.
"Achieving Excellence Through Costumer Service Unggul Bersaing Melalui Layanan Pelangggan".
Jakarta:
Gramedia pustaka,
2003.
Text.