Schweiger, C. L. (2006). Methods of rider communication. Transportation Research Board.
Dyfyniad Arddull ChicagoSchweiger, Carol L. Methods of Rider Communication. Washington, D.C: Transportation Research Board, 2006.
Dyfyniad MLASchweiger, Carol L. Methods of Rider Communication. Transportation Research Board, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.