Hoel, L. A. (2011). Transportation infrastructure engineering: A multimodal integration S1 ed. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Hoel, Lester A. Transportation Infrastructure Engineering: A Multimodal Integration S1 Ed. Cengage Learning, 2011.
Lua MLA (8ú heag.)Hoel, Lester A. Transportation Infrastructure Engineering: A Multimodal Integration S1 Ed. Cengage Learning, 2011.
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