Gaya APA
TUIJN, J. (1937).
GEOLOGICAL MAP OF SUMATRA Scale: 1:200.000 (EXPLANATORY NOTES TO SHEET 9,GEDUNGRATU) .
Bandung:
Direktorat Batubara.
Gaya MLA
TUIJN, J.F.VAN.
"GEOLOGICAL MAP OF SUMATRA Scale: 1:200.000 (EXPLANATORY NOTES TO SHEET 9,GEDUNGRATU)".
Bandung:
Direktorat Batubara,
1937.
Batubara.