Church, H. V. (1925). Illinois: History, geography, government. Heath.
Dyfyniad Arddull ChicagoChurch, Harry Victor. Illinois: History, Geography, Government. Boston: Heath, 1925.
Dyfyniad MLAChurch, Harry Victor. Illinois: History, Geography, Government. Heath, 1925.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.