Gaya APA

project, E, C, O, O, I, C, E. (1993). The Third Annual Plan Of Opratian . Jakarta: executive council of ombilin III coal exploration project.

Gaya MLA

project, Executive, Council, Of, Ombilin, III, Coal, Exploration. "The Third Annual Plan Of Opratian". Jakarta: executive council of ombilin III coal exploration project, 1993. Batubara.