Roberts, D. (1980). American railroads: The case for nationalization. New York: Pathfinder.
Lua i Stíl Chicago (17ú heag.)Roberts, Dick. American Railroads: The Case for Nationalization. New York: Pathfinder, 1980.
Lua MLA (8ú heag.)Roberts, Dick. American Railroads: The Case for Nationalization. New York: Pathfinder, 1980.
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