Gaya APA
Ubaghs, I. (1940).
The Occurrence Of Copper, Lead-And Zinc-Ores In Borneo .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Ubaghs, Ir.J.G.H..
"The Occurrence Of Copper, Lead-And Zinc-Ores In Borneo".
Bandung:
Pusat Sumber Daya Geologi,
1940.
Logam.