Gaya APA
Geologi, P, S, D. (1987).
General Circumtances,Geological,and Coal Deposit Of Sinamar Area .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Geologi, Pusat, Sumber, Daya.
"General Circumtances,Geological,and Coal Deposit Of Sinamar Area".
Bandung:
Pusat Sumber Daya Geologi,
1987.
Batubara.