Roess, R. P. (2004). Traffic Engineering ed.3Roger P.Roess, Elena S. Prassas, William R. McShane. Pearson Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Roess, Roger P. Traffic Engineering Ed.3Roger P.Roess, Elena S. Prassas, William R. McShane. Pearson Prentice Hall, 2004.
Lua MLA (8ú heag.)Roess, Roger P. Traffic Engineering Ed.3Roger P.Roess, Elena S. Prassas, William R. McShane. Pearson Prentice Hall, 2004.
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