Locklin, D. P. (1972). Economics of Transportation (7th ed.). Richard D. Irwin.
Dyfyniad Arddull ChicagoLocklin, D. Philiph. Economics of Transportation. 7th ed. Illiniois: Richard D. Irwin, 1972.
Dyfyniad MLALocklin, D. Philiph. Economics of Transportation. 7th ed. Richard D. Irwin, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.