Board, 1. H. R. (1959). Trip generation and urban freeway planning. Washington DC: Highway Research Board.
Dyfyniad Arddull ChicagoBoard, 130 Highway Research. Trip Generation and Urban Freeway Planning. Washington DC: Highway Research Board, 1959.
Dyfyniad MLABoard, 130 Highway Research. Trip Generation and Urban Freeway Planning. Washington DC: Highway Research Board, 1959.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.