Gaya APA
Koolhoven, W. (1942).
Mine Bureau, Bandoeng. The Mineral Resources Of Celebes .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Koolhoven, W.C.B..
"Mine Bureau, Bandoeng. The Mineral Resources Of Celebes".
Bandung:
Pusat Sumber Daya Geologi,
1942.
Logam.