Region 1, Ilocos Region: Road network and infrastracture system. s.n.
Dyfyniad Arddull ChicagoRegion 1, Ilocos Region: Road Network and Infrastracture System. [S.l: s.n.
Dyfyniad MLARegion 1, Ilocos Region: Road Network and Infrastracture System. s.n.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.