Gaya APA
Udoyono, B. (2012).
English Conversation For Customer Service and Sales Promotion Staff (Ke-1).
yogyakarta:
Rineka Cipta.
Gaya MLA
Udoyono, Bambang.
"English Conversation For Customer Service and Sales Promotion Staff".
Ke-1
yogyakarta:
Rineka Cipta,
2012.
Text.