APA (7th ed.) Citation

-. (1991). Proceedings the twentieth annual convention. Ikatan Ahli Geologi Indonesia.

Chicago Style (17th ed.) Citation

-. Proceedings the Twentieth Annual Convention. Ikatan Ahli Geologi Indonesia, 1991.

MLA (8th ed.) Citation

-. Proceedings the Twentieth Annual Convention. Ikatan Ahli Geologi Indonesia, 1991.

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