Gaya APA
Willem, V, B, R. (1949).
The Geology Of Indonesia: Economic Geology (Volume II).
The Hague:
Government Printing Office.
Gaya MLA
Willem, VAN, BEMMELEN,, Reinout.
"The Geology Of Indonesia: Economic Geology".
Volume II
The Hague:
Government Printing Office,
1949.
Text.