Gaya APA
M.E., J, K. (1943).
Coal in The East Indian Archipelago VII.Literature .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
M.E., J., Kleinsmide.
"Coal in The East Indian Archipelago VII.Literature".
Bandung:
Pusat Sumber Daya Geologi,
1943.
Batubara.