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