Gaya APA
Becker, J. (1981).
Perlite: a raw material with industrial potential .
Bandung:
Direktorat Sumber Daya Mineral.
Gaya MLA
Becker, Jacques.
"Perlite: a raw material with industrial potential".
Bandung:
Direktorat Sumber Daya Mineral,
1981.
Umum.