Gaya APA

Leeflang, W. (1978). Report To Department Pertambangan On Reconnaissance For Coal Outcrops Northeast Kalimantan Sajau Area . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Leeflang, W.A.W.. "Report To Department Pertambangan On Reconnaissance For Coal Outcrops Northeast Kalimantan Sajau Area". Bandung: Pusat Sumber Daya Geologi, 1978. Batubara.