Gaya APA
Johnson, C. (1994).
A Report on The Geochemistry of Stream Sedimen Samples From Sumatra .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Johnson, C.C..
"A Report on The Geochemistry of Stream Sedimen Samples From Sumatra".
Bandung:
Pusat Sumber Daya Geologi,
1994.
Geokimia.