Frye, F. F. (1973). Alternative multimodal passenger transportation systems: Comparative economic analysis. Highway Research Board, National Research Council.
Citace podle Chicago (17th ed.)Frye, Frederick F. Alternative Multimodal Passenger Transportation Systems: Comparative Economic Analysis. [Washington]: Highway Research Board, National Research Council, 1973.
Citace podle MLA (9th ed.)Frye, Frederick F. Alternative Multimodal Passenger Transportation Systems: Comparative Economic Analysis. Highway Research Board, National Research Council, 1973.
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