Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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