Gaya APA

Hariyanto, S. (2006). English Business Correspondence : A Practicak Guide for Business and Secretarial Students and Professional Secretaries . Yogyakarta: Kanisius.

Gaya MLA

Hariyanto, Sugeng. "English Business Correspondence : A Practicak Guide for Business and Secretarial Students and Professional Secretaries". Yogyakarta: Kanisius, 2006. Book.