Gaya APA

V., S, M, N. (1974). CONFIDENTIAL SOUTH SUMATRA COAL PROJECT EXPERIMENTAL GEOLECTRIC SURVEY . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

V., SHELL, MIJNBOUW, N.. "CONFIDENTIAL SOUTH SUMATRA COAL PROJECT EXPERIMENTAL GEOLECTRIC SURVEY". Bandung: Direktorat Sumber Daya Mineral, 1974. Batubara.