1. Joseph A. Galloway. Interurban Trails.
NRHS Eastern Ohio Chapter, 1945.
2. Lawrence A. Brough. The Electric Pullman: A History of the Niles Car & Manufacturing Company.
Indiana University Press, 2013.
3. Lawrence A. Brough and James H. Graebner. From Small Town to Downtown: A History of the Jewett Car Company, 1893-1919
(Railroads Past and Present). Indiana University Press, 2004.
— a personal site of Dr. Harold E. Cox with author’s books and car builders’ order lists.