Gaya APA

Venture, K, G, J. (1987). South sumatera coal exploration Project Comprative Evalution Of South sumatera Coal Resources . Bandung: Kinhill- Otto Gold Joint Venture.

Gaya MLA

Venture, Kinhill-Otoo, Gold, Joint. "South sumatera coal exploration Project Comprative Evalution Of South sumatera Coal Resources". Bandung: Kinhill- Otto Gold Joint Venture, 1987. Batubara.