Gaya APA

J.L, T. (1990). Nineteenth Annual Convention Indonesian Petroleum Association ; Volume 1 - Exploration, Economics and Environment . Jakarta: Jakarta : Indonesia Petroleum Ass,.

Gaya MLA

J.L, Tweed. "Nineteenth Annual Convention Indonesian Petroleum Association ; Volume 1 - Exploration, Economics and Environment". Jakarta: Jakarta : Indonesia Petroleum Ass,, 1990. Text.