Citazione APA

Independent Petroleum Association of America. (1971). Petroleum independent. Independent Petroleum Association of America].

Stile di citazione Chicago

Independent Petroleum Association of America. Petroleum Independent. [Tulsa, Okla.: Independent Petroleum Association of America], 1971.

Citazione MLA

Independent Petroleum Association of America. Petroleum Independent. Independent Petroleum Association of America], 1971.

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