Gaya APA
J.sutton, W. (1953).
The Need High-Alumina Refractories In Indonesia .
Bandung:
Sub Direktorat Inventarisasi Panasbumi.
Gaya MLA
J.sutton, Willard.
"The Need High-Alumina Refractories In Indonesia".
Bandung:
Sub Direktorat Inventarisasi Panasbumi,
1953.
Batubara.