Crowther, G. (1963). Traffic in towns. Penguin.
Dyfyniad Arddull ChicagoCrowther, Geoffrey. Traffic in Towns. England: Penguin, 1963.
Dyfyniad MLACrowther, Geoffrey. Traffic in Towns. Penguin, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.