APA (7th ed.) Zitazioa
Hay,William W. (1977). An introduction to transportation engineering (2nd ed.). Robert E.Krieger pub..
Chicago Style (17th ed.) Zitazioa
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. New York: Robert E.Krieger pub., 1977.
MLA (9th ed.) Zitazioa
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. Robert E.Krieger pub., 1977.
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