Gaya APA
Hafny, M, N. (1978).
Notes on genzl report and the comments of north sulawesi geophysics .
Bandung:
Direktorat Sumber Daya Mineral.
Gaya MLA
Hafny, Moh., Noer,.
"Notes on genzl report and the comments of north sulawesi geophysics".
Bandung:
Direktorat Sumber Daya Mineral,
1978.
Umum.