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