Gaya APA

Harahap, A, E., Swanson, C, P. (). **Hitung dagang 1 . Semarang:: Semarang: Coy; 1951.

Gaya MLA

Harahap, A., Effendi., Swanson, Carl, P.. "**Hitung dagang 1". Semarang:: Semarang: Coy; 1951, . Text.