Fertal, M. J. (1966). Modal split: Documentation of nine methods for estimating transit usage. Washington, D.C: U.S. Department of Commerce. Bureau of Public Roads. Office of Planning.
Παραπομπή Chicago StyleFertal, Martin J. Modal Split: Documentation of Nine Methods for Estimating Transit Usage. Washington, D.C: U.S. Department of Commerce. Bureau of Public Roads. Office of Planning, 1966.
Παραπομπή MLAFertal, Martin J. Modal Split: Documentation of Nine Methods for Estimating Transit Usage. Washington, D.C: U.S. Department of Commerce. Bureau of Public Roads. Office of Planning, 1966.
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