National Research Council (U.S.). Highway Research Board. (1960). Effects of traffic control devices: Presented at the 38th annual meeting, January 5-9, 1959. National Academy of Science - National Research Council.
Lua i Stíl Chicago (17ú heag.)National Research Council (U.S.). Highway Research Board. Effects of Traffic Control Devices: Presented at the 38th Annual Meeting, January 5-9, 1959. Washington, D.C: National Academy of Science - National Research Council, 1960.
Lua MLA (9ú heag.)National Research Council (U.S.). Highway Research Board. Effects of Traffic Control Devices: Presented at the 38th Annual Meeting, January 5-9, 1959. National Academy of Science - National Research Council, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.