Gaya APA

LETHE, D, I, F. (1957). Report on the examination of the Bukit Asam Coals from the Middle Palembang area in South Sumatra. . Bandung: Direktorat Batubara.

Gaya MLA

LETHE, Dr., Ing., F.. "Report on the examination of the Bukit Asam Coals from the Middle Palembang area in South Sumatra.". Bandung: Direktorat Batubara, 1957. Batubara.