Gaya APA

setyarini, S., sulistyo, U. (2007). Successful english for business : Develop your speaking skill in the business. (Ed.1). Yogyakarta: Andi.

Gaya MLA

setyarini, Susana., sulistyo, Ule. "Successful english for business : Develop your speaking skill in the business.". Ed.1 Yogyakarta: Andi, 2007. Text.