United Nations. Economic Commission for Europe. (1978). Coal, 1985 and beyond: A perspective study of the coal industry in Europe and North America. Published for the United Nations by Pergamon Press.
Cita Chicago (17th ed.)United Nations. Economic Commission for Europe. Coal, 1985 and Beyond: A Perspective Study of the Coal Industry in Europe and North America. Oxford ; New York: Published for the United Nations by Pergamon Press, 1978.
Cita MLA (8th ed.)United Nations. Economic Commission for Europe. Coal, 1985 and Beyond: A Perspective Study of the Coal Industry in Europe and North America. Published for the United Nations by Pergamon Press, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.