Gaya APA
Halmahera, P, P, I. (1982).
Gombong Cement Plant Feasibility Study : Volume II Engineering .
Jakarta:
PT. Permata Inka Halmahera.
Gaya MLA
Halmahera, PT., Permata, Inka.
"Gombong Cement Plant Feasibility Study : Volume II Engineering".
Jakarta:
PT. Permata Inka Halmahera,
1982.
Text.