McHugh, J. (1980). Alexander Holley and the makers of steel. Baltimore: The Johns Hopkins University Press.
Dyfyniad Arddull ChicagoMcHugh, Jeanne. Alexander Holley and the Makers of Steel. Baltimore: The Johns Hopkins University Press, 1980.
Dyfyniad MLAMcHugh, Jeanne. Alexander Holley and the Makers of Steel. Baltimore: The Johns Hopkins University Press, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.