Dyfyniad APA

Ball, D. (1980). America's railroads: The second generation. New York: Norton.

Dyfyniad Arddull Chicago

Ball, Don. America's Railroads: The Second Generation. New York: Norton, 1980.

Dyfyniad MLA

Ball, Don. America's Railroads: The Second Generation. New York: Norton, 1980.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.