Gaya APA
Lerche, D. (1974).
Sumatera Regional Planning Study Province South Sumatra Infrastructure .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Lerche, Dietrich.
"Sumatera Regional Planning Study Province South Sumatra Infrastructure".
Bandung:
Pusat Sumber Daya Geologi,
1974.
Bukan Logam.