Gaya APA

INC., A, M, C, C. (1982). DIRECTORATE OF COAL DIRECTORATE GENERAL OF MINES OMBILIN II COAL PROJECT CONSULTANCY SUPPLEMENTARY QUALIFICATIONS . Bandung: Direktorat Jendral Pertambangan Umum.

Gaya MLA

INC., A.T., MASSEY, COAL, COMPANY,. "DIRECTORATE OF COAL DIRECTORATE GENERAL OF MINES OMBILIN II COAL PROJECT CONSULTANCY SUPPLEMENTARY QUALIFICATIONS". Bandung: Direktorat Jendral Pertambangan Umum, 1982. Batubara.