U.S. Route 151 in Wisconsin

Almuzara, 2009, pp. 10-11 and 23-24> Payne, S.G. The Franco Regime, 1936–1975. Madison: University of Wisconsin. 1987: 268.  Payne 1987，第274, note 28頁. Benton

Transit's Stepchild: The Trolley Coach. 洛杉矶: Interurban Press. 1973年. LCCN 73084356.  Murray (2000), p. 79. Kunz, Richard R. Twin Wires: First U.S. Trolley