Gaya APA
J.KLIENSMIEDE,M.E., . (1942).
COAL IN THE EAST-INDIAN ACHIPELAGO.IIA.THE ISLANDS WEST OF SUMATRA.1942 .
Bandung:
Direktorat Batubara.
Gaya MLA
J.KLIENSMIEDE,M.E., .
"COAL IN THE EAST-INDIAN ACHIPELAGO.IIA.THE ISLANDS WEST OF SUMATRA.1942".
Bandung:
Direktorat Batubara,
1942.
Batubara.