Robertson, H. D. (1994). Manual of transportation engineering studies. Prentice-Hall.
Tohutoru Kātū Chicago (17th ed.)Robertson, H. Douglas. Manual of Transportation Engineering Studies. Englewood Cliffs: Prentice-Hall, 1994.
Tohutoro MLA (9th ed.)Robertson, H. Douglas. Manual of Transportation Engineering Studies. Prentice-Hall, 1994.
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