Gaya APA
Tschohl, J. et al (2003).
Achieving Excellence through customer service : unggul bersaing melalui layanan pelanggan .
Jakarta:
.
Gaya MLA
Tschohl, John. et al.
"Achieving Excellence through customer service : unggul bersaing melalui layanan pelanggan".
Jakarta:
,
2003.
Text.