International Federation of Petroleum and Chemical Workers. Petro (English ed.). International Federation of Petroleum and Chemical Workers.
Cita Chicago (17th ed.)International Federation of Petroleum and Chemical Workers. Petro. English ed. Denver, Colo.: International Federation of Petroleum and Chemical Workers.
Cita MLA (8th ed.)International Federation of Petroleum and Chemical Workers. Petro. English ed. International Federation of Petroleum and Chemical Workers.
Atenció: Aquestes cites poden no estar 100% correctes.