Gaya APA
V.Mueller, G. (1957).
Idjen Crater Lake Project East Java, Republic Of Indonesia .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
V.Mueller, George.
"Idjen Crater Lake Project East Java, Republic Of Indonesia".
Bandung:
Pusat Sumber Daya Geologi,
1957.
Logam.