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.