United nations industrial development organization Vienna. (1973). The petrochemical industry. New York: United Nation.
Trích dẫn kiểu ChicagoUnited nations industrial development organization Vienna. The Petrochemical Industry. New York: United Nation, 1973.
Deismireacht MLAUnited nations industrial development organization Vienna. The Petrochemical Industry. New York: United Nation, 1973.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.