Stephen B. Goddard: Getting There: The Epic Struggle Between Road and Rail in the American Century. University of Chicago Press, 1996, ISBN 978-0-226-30043-6, S.126– (google.com).
Glenn Yago: The Decline of Transit: Urban Transportation in German and U.S. Cities, 1900–1970. Cambridge University Press, 1984, ISBN 978-0-521-25633-9, S.59– (google.com).
Peter Cachola Schmal / Annette Becker: Stadtgrün / Urban Green: Europäische Landschaftsarchitektur für das 21. Jahrhundert / European Landscape Architecture for the 21st century. Walter de Gruyter, 2010, ISBN 978-3-0346-1133-6, S.90– (google.com).
Van Wilkins: The Conspiracy Revisited. The New Electric Railway Journal, 1995, abgerufen am 27. Mai 2009.
google.de
books.google.de
Robert K Musil: Rachel Carson and Her Sisters: Extraordinary Women Who Have Shaped America's Environment. Rutgers University Press, 2014, ISBN 978-0-8135-7176-8, S.145– (google.de).
Cutler J. Cleveland and Christopher G. Morris: Handbook of Energy: Chronologies, Top Ten Lists, and Word Clouds. Elsevier Science, 2013, ISBN 978-0-12-417019-3, S.606– (google.de).
Robert C. Post: Urban Mass Transit: The Life Story of a Technology. Greenwood Publishing Group, 2007, ISBN 978-0-313-33916-5, S.156 (google.de).
Cliff Slater: General Motors and the Demise of Streetcars. In: Transportation Quarterly, Vol. 51. No. 3, Summer 1997, S. 45–66, online (Memento vom 3. März 2001 im Internet Archive)
