Locklin, D. P. (1966). Economics of transportation. R. D. Irwin.
Tohutoru Kātū Chicago (17th ed.)Locklin, David Philip. Economics of Transportation. Homewood, Ill.: R. D. Irwin, 1966.
Tohutoro MLA (9th ed.)Locklin, David Philip. Economics of Transportation. R. D. Irwin, 1966.
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