Gaya APA

E, L, R. (1974). Preliminary Report On A Visit To The Bukit Asam Coal Mines, Sumatera Indonesia, February 2-4, 1979 . : .

Gaya MLA

E, Landis, R.. "Preliminary Report On A Visit To The Bukit Asam Coal Mines, Sumatera Indonesia, February 2-4, 1979". : , 1974. Text.