Gaya APA

GEOLOGISTS, I, A, O., Ryan, P. (1993). Proceedings 22nd annual convention volume I (Theme: challenging the frontier geology in Indonesia) . : IAGI.

Gaya MLA

GEOLOGISTS, INDONESIAN, ASSOCIATION, OF., Ryan, Peter. "Proceedings 22nd annual convention volume I (Theme: challenging the frontier geology in Indonesia)". : IAGI, 1993. Buku.