Gaya APA
Venture, K, G, J. (1987).
South Sumatra Coal Exploration Project .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Venture, Kinhill-Otto, Gold, Joint.
"South Sumatra Coal Exploration Project".
Bandung:
Pusat Sumber Daya Geologi,
1987.
Batubara.