Gaya APA
Setyarini, S., Ule, I, S. (2007).
Successful english for business: develop your speaking skill in the business .
Yogyakarta:
.
Gaya MLA
Setyarini, Susana., Ule, I., Sulistyo,.
"Successful english for business: develop your speaking skill in the business".
Yogyakarta:
,
2007.
.