Gaya APA
S.sigit, . (1959).
Oil Map Of Indonesian 1:2.000.000 A brief explanation .
Bandung:
the geological survey of indonesian.
Gaya MLA
S.sigit, .
"Oil Map Of Indonesian 1:2.000.000 A brief explanation".
Bandung:
the geological survey of indonesian,
1959.
Batubara.