Gaya APA

Ubaghs, I. (). The Iron Ore Fieeds In S.E. Kalimantan From September 30 To October 13, 1940 . United State: Dinas Vulkanologi Bagian Projek Survey Enersi Geothermal.

Gaya MLA

Ubaghs, Ir.J.G.H.. "The Iron Ore Fieeds In S.E. Kalimantan From September 30 To October 13, 1940". United State: Dinas Vulkanologi Bagian Projek Survey Enersi Geothermal, . Logam.