Womack, J. P. (1990). The Machine that Changed the World. Rawson Associates.
Dyfyniad Arddull ChicagoWomack, James P. The Machine That Changed the World. Rawson Associates, 1990.
Dyfyniad MLAWomack, James P. The Machine That Changed the World. Rawson Associates, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.