Gaya APA

river, . (1963). Conclusion Concering the Trip To the mahamahk Besar Coal Deposite In The middle Reaches Of the mahakam . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

river, . "Conclusion Concering the Trip To the mahamahk Besar Coal Deposite In The middle Reaches Of the mahakam". Bandung: Pusat Sumber Daya Geologi, 1963. Batubara.