Gaya APA
Udoyono, B. (2012).
English Conversation for Customer Service and Sales Promotion Staff .
Yogyakarta:
Andi Yogyakarta.
Gaya MLA
Udoyono, Bambang.
"English Conversation for Customer Service and Sales Promotion Staff".
Yogyakarta:
Andi Yogyakarta,
2012.
Text.