Gaya APA

Enong, D, A., Sjah, D, D. (1983). PRACTICAL GUIDE TO BUSINESS COR RESPONDENCE . Jakarta: SIMPLEX PUBSLIHING COMPANY.

Gaya MLA

Enong, Dra., Azimar., Sjah, Drs., Djalinus. "PRACTICAL GUIDE TO BUSINESS COR RESPONDENCE". Jakarta: SIMPLEX PUBSLIHING COMPANY, 1983. Text.