HAY, W. W. (1977). An Introduction To Transportation Engeneering William W. Hay. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)HAY, William W. An Introduction To Transportation Engeneering William W. Hay. John Wiley & Sons, 1977.
Lua MLA (8ú heag.)HAY, William W. An Introduction To Transportation Engeneering William W. Hay. John Wiley & Sons, 1977.
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