Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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