Gaya APA
NEDO-DGM, . (1991).
Presentation On Central Sumatra Joint Coal Exploration Project .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
NEDO-DGM, .
"Presentation On Central Sumatra Joint Coal Exploration Project".
Bandung:
Pusat Sumber Daya Geologi,
1991.
Text.