Johnson, E. R. (1909). Elements of transportation: A discussion of steam railroad, electric railway, and ocean and inland water transportation. D. Appleton and Company.
Citace podle Chicago (17th ed.)Johnson, Emory R. Elements of Transportation: A Discussion of Steam Railroad, Electric Railway, and Ocean and Inland Water Transportation. New York, ; London,: D. Appleton and Company, 1909.
Citace podle MLA (8th ed.)Johnson, Emory R. Elements of Transportation: A Discussion of Steam Railroad, Electric Railway, and Ocean and Inland Water Transportation. D. Appleton and Company, 1909.
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