Gaya APA

Thomas, L., Haryoko, S. (1980). The East Kalimantan Coal Project Report On The Coal Geology Of Loa Kulu And Loa Haur . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Thomas, L.P.., Haryoko, S.. "The East Kalimantan Coal Project Report On The Coal Geology Of Loa Kulu And Loa Haur". Bandung: Pusat Sumber Daya Geologi, 1980. Batubara.