Locklin, D. P. (1966). Economics of transportation. R. D. Irwin.
Chicago-čujuhus (17. p.)Locklin, David Philip. Economics of Transportation. Homewood, Ill.: R. D. Irwin, 1966.
MLA-čujuhus (9. p.)Locklin, David Philip. Economics of Transportation. R. D. Irwin, 1966.
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