Gaya APA

Ruswandi, E., Peart, R, J. (1987). Geophysical Exploration For Primary Tin And Tungsten Mineralisation At Hatapang, Sumatra Utara, Nortern Sumatra . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Ruswandi, E.., Peart, R., J.. "Geophysical Exploration For Primary Tin And Tungsten Mineralisation At Hatapang, Sumatra Utara, Nortern Sumatra". Bandung: Pusat Sumber Daya Geologi, 1987. Geokimia.