Ebert, Robert R. Flxible: A History of the Bus and the Company. Yellow Springs, Ohio: Antique Power, Inc. 2001: 134, 204, 222. ISBN 0-9660751-2-9.
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Crandall, Robert W.; Elzinga, Kenneth G. Injunctive Relief in Sherman Act Monopolization Cases(PDF). Journal of Research in Law and Economics (The Brookings Institution). 2002-04-24: 68–81 [2007-02-04]. (原始内容(PDF)存档于2007-01-01).
Georgano, G.N.(英语:Georgano, G.N.), Editor (1978). The Complete Encyclopedia of Commercial Vehicles. Krause Publications. ISBN0-87341-024-6.
Ebert, Robert R. (2001). Flxible: A History of the Bus and the Company, Yellow Springs, OH: Antique Power, Inc. ISBN0-9660751-2-9.
Luke, William A. (2003). Flxible Intercity Buses: 1924–1970 Photo Archive, Hudson, WI: Iconografix. ISBN1-58388-108-5.
Luke, William A. & Metler, Linda L. (2005). City Transit Buses of the 20th Century, Hudson, WI: Iconografix. ISBN1-58388-146-8.
Luke, William A. & Metler, Linda L. (2004). Highway Buses of the 20th Century, Hudson, WI: Iconografix. ISBN1-58388-121-2.