Dyfyniad APA

European Transport Research Review | SpringerOpen. Cambridge University Press.

Dyfyniad Arddull Chicago

European Transport Research Review | SpringerOpen. Cambridge University Press.

Dyfyniad MLA

European Transport Research Review | SpringerOpen. Cambridge University Press.

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