Gaya APA

Mitchelll, D. (1953). Proposal For A Short Term Increase of Production From The Ombilin Coal Mine, 1953 . Bandung: Direktorat Jenderal Pertambangan Umum Direktorat Batubara.

Gaya MLA

Mitchelll, D.W.. "Proposal For A Short Term Increase of Production From The Ombilin Coal Mine, 1953". Bandung: Direktorat Jenderal Pertambangan Umum Direktorat Batubara, 1953. Batubara.