Gaya APA

Medan, K, W, D, P, S, U. (1990). Term of reference recconaissance survey of Muara Soma coal resource . : Kanwil DPE Prop. Sumatera Utara.

Gaya MLA

Medan, KANTOR, Wil, DPE, Prop., Sumatera, Utara. "Term of reference recconaissance survey of Muara Soma coal resource". : Kanwil DPE Prop. Sumatera Utara, 1990. Laporan.