Gaya APA

Sjah, D., Enong, A. (1983). Practical guide to business correspondence (pedoman praktis korespondensi Inggeris) . Jakarta: Simplex Publishing Company.

Gaya MLA

Sjah, Djalinus., Enong, Azimar. "Practical guide to business correspondence (pedoman praktis korespondensi Inggeris)". Jakarta: Simplex Publishing Company, 1983. BUKU.