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