Gaya APA
Madiadipora, T.
(1969).
Sulphur Deposits In North Sulawesi
.
Bandung:
The Geological Server Of Indonesia.
Gaya MLA
Madiadipora, T..
"Sulphur Deposits In North Sulawesi".
Bandung:
The Geological Server Of Indonesia,
1969.
Bukan Logam.