Παραπομπή APA
Hay, W. W. (1977). An introduction to transportation engineering (2nd ed.). New York: John Wiley & Sons.
Παραπομπή Chicago StyleHay, William W. An Introduction to Transportation Engineering. 2nd ed. New York: John Wiley & Sons, 1977.
Παραπομπή MLAHay, William W. An Introduction to Transportation Engineering. 2nd ed. New York: John Wiley & Sons, 1977.
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