Gaya APA

Delegation, T, R, O, I. (1993). Current Status Of Coal Development And Utilization In Indonesia . Jakarta: Pusat Sumber Daya Geologi.

Gaya MLA

Delegation, The, Republic, Of, Indonesia. "Current Status Of Coal Development And Utilization In Indonesia". Jakarta: Pusat Sumber Daya Geologi, 1993. Batubara.