Gaya APA
UNDP, . (1976).
The Unido Project For Building Material Industries In Indonesia .
Bandung:
Direktorat Sumber Daya Mineral.
Gaya MLA
UNDP, .
"The Unido Project For Building Material Industries In Indonesia".
Bandung:
Direktorat Sumber Daya Mineral,
1976.
Umum.