Gaya APA

Suyarto, ., Rachdiana, H. (2009). English Business Correspondence (Kelima Cet-6). Bandung: humaniora.

Gaya MLA

Suyarto, ., Rachdiana, Hetty. "English Business Correspondence". Kelima Cet-6 Bandung: humaniora, 2009. Textbook.