Usselman, S. W. (2002). Regulating railroad innovation: Business, technology, and politics in America, 1840-1920. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Usselman, Steven W. Regulating Railroad Innovation: Business, Technology, and Politics in America, 1840-1920. Cambridge, U.K. ; New York: Cambridge University Press, 2002.
Lua MLA (9ú heag.)Usselman, Steven W. Regulating Railroad Innovation: Business, Technology, and Politics in America, 1840-1920. Cambridge University Press, 2002.
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