Gaya APA

Nicholson, R., Budhiastuty, S. (1986). Sample Preparation and Methods of Chemical Analysis Used by The Northern Sumatra Geochemcila and Mineral Exploration Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

Nicholson, R.A.., Budhiastuty, S.E.. "Sample Preparation and Methods of Chemical Analysis Used by The Northern Sumatra Geochemcila and Mineral Exploration Project". Bandung: Pusat Sumber Daya Geologi, 1986. Geokimia.