Gaya APA
The Coke Problem Of The Indonesian Coals 1927
.
(1927).
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
The Coke Problem Of The Indonesian Coals 1927
.
.
Bandung:
Pusat Sumber Daya Geologi,
1927.
Batubara.