Hogan, W. T. (1983). World steel in the 1980s. Toronto: Lexington.
Dyfyniad Arddull ChicagoHogan, William T. World Steel in the 1980s. Toronto: Lexington, 1983.
Dyfyniad MLAHogan, William T. World Steel in the 1980s. Toronto: Lexington, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.