Gaya APA

Kraeff, D., Dr.F.Laufer, . (1938). The Geology And Hydrology Of West And Central Sumba And Their Relationship To The Water Supply And The Rural Economy . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

Kraeff, Drs.A.., Dr.F.Laufer, . "The Geology And Hydrology Of West And Central Sumba And Their Relationship To The Water Supply And The Rural Economy". Bandung: Direktorat Sumber Daya Mineral, 1938. Bukan Logam.