Gaya APA
Hok, D, I, T, S. (1940).
Report About A Trip To The Find Places Of Clay .
Bandung:
Pusat Sumber Daya Geologi.
Gaya MLA
Hok, Dr., Ir., Tan, Sin.
"Report About A Trip To The Find Places Of Clay".
Bandung:
Pusat Sumber Daya Geologi,
1940.
Bukan Logam.