Gaya APA

HARTMANN, D. (1918). Geological report on the Coal-occurence in the Mining Concessions "SUKAMARINDA" and "BUNIAN" and the Coalfield "AYER SERILLO", Residency palembang. . Bandung: Direktorat Batubara.

Gaya MLA

HARTMANN, Dr.E.. "Geological report on the Coal-occurence in the Mining Concessions "SUKAMARINDA" and "BUNIAN" and the Coalfield "AYER SERILLO", Residency palembang.". Bandung: Direktorat Batubara, 1918. Batubara.