Lua APA (7ú heag.)

National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, & National Research Council (U.S.). Highway Research Board. Special Committee on International Cooperative Activities. (1969). International transportation topics: 4 reports ; sign uniformity, closing the Darien gap, transportation in Europe, and transportation in Great Britain. Highway Research Board.

Lua i Stíl Chicago (17ú heag.)

National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, agus National Research Council (U.S.). Highway Research Board. Special Committee on International Cooperative Activities. International Transportation Topics: 4 Reports ; Sign Uniformity, Closing the Darien Gap, Transportation in Europe, and Transportation in Great Britain. Washington: Highway Research Board, 1969.

Lua MLA (9ú heag.)

National Research Council (U.S.). Highway Research Board, et al. International Transportation Topics: 4 Reports ; Sign Uniformity, Closing the Darien Gap, Transportation in Europe, and Transportation in Great Britain. Highway Research Board, 1969.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.