Dyfyniad APA
Hay,William W. (1977). An introduction to transportation engineering (2nd ed.). Robert E.Krieger pub..
Dyfyniad Arddull Chicago
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. New York: Robert E.Krieger pub., 1977.
Dyfyniad MLA
Hay,William W. An Introduction to Transportation Engineering. 2nd ed. Robert E.Krieger pub., 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.