Independent Petroleum Association of America. The Oil producing industry in your state. Petroleum Independent Publishers.
Chicago-Zitierstil (17. Ausg.)Independent Petroleum Association of America. The Oil Producing Industry in Your State. [Washington: Petroleum Independent Publishers.
MLA-Zitierstil (8. Ausg.)Independent Petroleum Association of America. The Oil Producing Industry in Your State. Petroleum Independent Publishers.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.