Gaya APA

G., D, R, K. (1957). Investigation into the Geological and Mining Aspects of the Iron-ore and Coal Deposits in Indonesia. . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

G., Dr., Rohland, K.. "Investigation into the Geological and Mining Aspects of the Iron-ore and Coal Deposits in Indonesia.". Bandung: Direktorat Sumber Daya Mineral, 1957. Batubara.