Gaya APA

ZWIERZYCKI, D, J. (1919). GENERAL GEOLOGICAL MAP OF THE NETHERLANDS EAST INDIES Scale 1 : 1 000 000 EXPLANATORY NOTE TO SHEET I (NORTH SUMATRA) . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

ZWIERZYCKI, Dr., J.. "GENERAL GEOLOGICAL MAP OF THE NETHERLANDS EAST INDIES Scale 1 : 1 000 000 EXPLANATORY NOTE TO SHEET I (NORTH SUMATRA)". Bandung: Direktorat Sumber Daya Mineral, 1919. Batubara.