-. (1991). Proceedings the twentieth annual convention. Ikatan Ahli Geologi Indonesia.
Citación estilo Chicago-. Proceedings the Twentieth Annual Convention. Ikatan Ahli Geologi Indonesia, 1991.
Cita MLA-. Proceedings the Twentieth Annual Convention. Ikatan Ahli Geologi Indonesia, 1991.
Warning: These citations may not always be 100% accurate.