Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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