Gaya APA

Katili, P. (1982). DIRECTORATE OF COAL DIRECTORATE GENERAL OF MINES OMBILIN II COAL PROJECT CONSULTANCY SUPLEMENTARY QUALIFICATIONS . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Katili, Prof.Dr.J.A.. "DIRECTORATE OF COAL DIRECTORATE GENERAL OF MINES OMBILIN II COAL PROJECT CONSULTANCY SUPLEMENTARY QUALIFICATIONS". Bandung: Pusat Sumber Daya Geologi, 1982. Batubara.