Cita APA (7th ed.)
Hay,William W. (1977). An introduction to transportation engineering (2nd ed.). Robert E.Krieger pub..
Cita Chicago (17th ed.)
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. New York: Robert E.Krieger pub., 1977.
Cita MLA (9th ed.)
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. Robert E.Krieger pub., 1977.
Atenció: Aquestes cites poden no estar 100% correctes.