APA (7th ed.) Zitazioa

Pegrum, D. F. (1968). transportation economics and public policy. Illinois.

Chicago Style (17th ed.) Zitazioa

Pegrum, Dudley F. Transportation Economics and Public Policy. Homewood: Illinois, 1968.

MLA (9th ed.) Zitazioa

Pegrum, Dudley F. Transportation Economics and Public Policy. Illinois, 1968.