Gaya APA
Hill, M, L. (1975).
The 3 R'S of petroleum exploration: resources, risks and rewards .
Bandung:
Direktorat Sumber Daya Mineral.
Gaya MLA
Hill, Mason, L.
"The 3 R'S of petroleum exploration: resources, risks and rewards".
Bandung:
Direktorat Sumber Daya Mineral,
1975.
Umum.