Gaya APA

Ubaghs, J, G, H. (1963). Preliminary Report For THe Months Of October, November and December Of The Year 1929 . Indonesia: Pusat Sumber Daya Geologi.

Gaya MLA

Ubaghs, J., G., H. "Preliminary Report For THe Months Of October, November and December Of The Year 1929". Indonesia: Pusat Sumber Daya Geologi, 1963. Logam.