Gaya APA

Mckenzie, L, &. et al (1982). Prequalification Statement for Ombilin II Coal Mining Project Central West Sumatra Indonesia . : P.N. Tambang Batubara.

Gaya MLA

Mckenzie, Longwort, &. et al. "Prequalification Statement for Ombilin II Coal Mining Project Central West Sumatra Indonesia". : P.N. Tambang Batubara, 1982. Batubara.