(1978). Steam coal. Paris: OECD.
Trích dẫn kiểu ChicagoSteam Coal. Paris: OECD, 1978.
Deismireacht MLASteam Coal. Paris: OECD, 1978.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.
(1978). Steam coal. Paris: OECD.
Trích dẫn kiểu ChicagoSteam Coal. Paris: OECD, 1978.
Deismireacht MLASteam Coal. Paris: OECD, 1978.