Gaya APA

Hariyanto, S., Sinubyo, . (2006). English business correspondence : a practical guide for business and secetarial students and professional scretaries . Yogyakarta: Kanisius.

Gaya MLA

Hariyanto, Sugeng., Sinubyo, . "English business correspondence : a practical guide for business and secetarial students and professional scretaries". Yogyakarta: Kanisius, 2006. Text.