Gaya APA

Ass.(IPA), I, P. (1991). Twentieth Annual Convention - Building for The Future ; Volume I - Exploration and Geothermal (1991). Jakarta: jakata ipa.

Gaya MLA

Ass.(IPA), Indonesian, Petroleum. "Twentieth Annual Convention - Building for The Future ; Volume I - Exploration and Geothermal". 1991 Jakarta: jakata ipa, 1991. Text.