Gaya APA

davis, A., Hartati, R. (1991). The Prepation of New Quality Control Samples For The Analysis of Samples From The Southern Sumatra Geological and Mineral Exploration Project . Bandung: Pusat Sumber Daya Geologi.

Gaya MLA

davis, A.E., Hartati, R.D.. "The Prepation of New Quality Control Samples For The Analysis of Samples From The Southern Sumatra Geological and Mineral Exploration Project". Bandung: Pusat Sumber Daya Geologi, 1991. Geokimia.