Gaya APA

Harahap, A, E. (1982). Hitung Dagang Jilid 1 . Semarang: Effendiharahap Publishing Coy.

Gaya MLA

Harahap, A., Effendi. "Hitung Dagang Jilid 1". Semarang: Effendiharahap Publishing Coy, 1982. Book.