1. David E. Nye American Technological Sublime 1994 MIT Press Cambridge MA 57
2. Carroll Pursell The Machine in America: A Social History of Technology 1995 Johns Hopkins University Press Baltimore 68
3. Howard Mumford Jones The Age of Energy: Varieties of American Experience 1865–1915 1970 Viking New York 152
4. Chevalier Michael Society Manners and Politics in the United States (1836) as quoted in Nye American Technological Sublime p. 46.
5. George Rogers Taylor The Transportation Revolution 1815–1860 1977 Armonk New York 443