Gaya APA

Hariyanto, S. (2010). English Business Correspondence : A Practical Guide for Business and Secretarial Student and Professional Secretaries (Cet. 5). Yogyakarta: Kanisius.

Gaya MLA

Hariyanto, Sugeng. "English Business Correspondence : A Practical Guide for Business and Secretarial Student and Professional Secretaries". Cet. 5 Yogyakarta: Kanisius, 2010. Monograf.