Gaya APA

Westerveld, D, J. (1933). GEOLOGICAL MAP OF SUMATRA Scale 1 : 200.000(EXPLANATORY NOTES TO SHEET 3 BENGKUNAT) . Bandung: Direktorat Batubara.

Gaya MLA

Westerveld, Dr., J.. "GEOLOGICAL MAP OF SUMATRA Scale 1 : 200.000(EXPLANATORY NOTES TO SHEET 3 BENGKUNAT)". Bandung: Direktorat Batubara, 1933. Batubara.