Dyfyniad APA

Pegrum, D. F. (1963). Transportation: Economics and public policy. Irwin.

Dyfyniad Arddull Chicago

Pegrum, Dudley Frank. Transportation: Economics and Public Policy. Homewood, Ill: Irwin, 1963.

Dyfyniad MLA

Pegrum, Dudley Frank. Transportation: Economics and Public Policy. Irwin, 1963.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.