Gaya APA

Sumarno, . (1937). Notes of Dr. Ir. N. H. van Doornick at the Hague, for the Geological Section of the Mining Bureau in Bandoeng about the iron- and coal-deposits of South East Borneo . Bandung: Departemen Pertambangan Direktorat Jendral Pertambangan Direktorat Geologi.

Gaya MLA

Sumarno, . "Notes of Dr. Ir. N. H. van Doornick at the Hague, for the Geological Section of the Mining Bureau in Bandoeng about the iron- and coal-deposits of South East Borneo". Bandung: Departemen Pertambangan Direktorat Jendral Pertambangan Direktorat Geologi, 1937. Logam.