Duffy, M. C. (2003). Electric railways 1880-1990. Institution of Engineering and Technology. https://doi.org/10.1049/PBHT031E
Lua i Stíl Chicago (17ú heag.)Duffy, M. C. Electric Railways 1880-1990. London, United Kingdom: Institution of Engineering and Technology, 2003. https://doi.org/10.1049/PBHT031E.
Lua MLA (9ú heag.)Duffy, M. C. Electric Railways 1880-1990. Institution of Engineering and Technology, 2003. https://doi.org/10.1049/PBHT031E.
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