Bureau of Railway Economics (Washington, D.C.), & Association of American Railroads. Bureau of Railway Economics. (1920). Railway revenues and expenses. The Bureau.
Chicago-viite (17. p.)Bureau of Railway Economics (Washington, D.C.), ja Association of American Railroads. Bureau of Railway Economics. Railway Revenues and Expenses. Washington, D.C.: The Bureau, 1920.
MLA-viite (8. p.)Bureau of Railway Economics (Washington, D.C.), ja Association of American Railroads. Bureau of Railway Economics. Railway Revenues and Expenses. The Bureau, 1920.
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