Gaya APA

LTD., S, C, M, C., INC., W, S, I. (1989). End Of Project Report On Central Sumatra Coal Logging Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

LTD., Sumitomo, Coal, Mining, Co.,., INC., Well, Surveys, International,. "End Of Project Report On Central Sumatra Coal Logging Project". Bandung: Pusat Sumber Daya Geologi, 1989. Batubara.