Gaya APA

Rohland, W. (1956). General Working Material For The Work to be Carried Out in Indonesia. "Wedexro" April 1956 . Jakarta: Pusat Sumber Daya Geologi.

Gaya MLA

Rohland, W.. "General Working Material For The Work to be Carried Out in Indonesia. "Wedexro" April 1956". Jakarta: Pusat Sumber Daya Geologi, 1956. Batubara.