O'Flaherty, C. A. (1974). Highways: Highways and Traffic (2nd ed.). Edward Arnold.
Lua i Stíl Chicago (17ú heag.)O'Flaherty, C. A. Highways: Highways and Traffic. 2nd ed. London: Edward Arnold, 1974.
Lua MLA (9ú heag.)O'Flaherty, C. A. Highways: Highways and Traffic. 2nd ed. Edward Arnold, 1974.
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