Citazione APA

Independent Petroleum Association of America. The Oil producing industry in your state. Petroleum Independent Publishers.

Stile di citazione Chicago

Independent Petroleum Association of America. The Oil Producing Industry in Your State. [Washington: Petroleum Independent Publishers.

Citazione MLA

Independent Petroleum Association of America. The Oil Producing Industry in Your State. Petroleum Independent Publishers.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.