Gaya APA

Rahardi, R., As'ad, R. (2009). Communicative english for secretaries: a comprehensive communication workbook for students of business and secretarial studies (Cet.1). Yogyakarta: Pustaka Book Publisher.

Gaya MLA

Rahardi, R.Kunjana., As'ad, Rodhi. "Communicative english for secretaries: a comprehensive communication workbook for students of business and secretarial studies". Cet.1 Yogyakarta: Pustaka Book Publisher, 2009. Textbook.