Gaya APA

Publikasi, T. (1981). Proceedings of the second symposium integrated geological survey of Northern Sumatra . Bandung: Direktorat Sumber Daya Mineral.

Gaya MLA

Publikasi, Tim. "Proceedings of the second symposium integrated geological survey of Northern Sumatra". Bandung: Direktorat Sumber Daya Mineral, 1981. Text.