Não informado. (1957). Traffic safety. National Safety Council.
Lua i Stíl Chicago (17ú heag.)Não informado. Traffic Safety. Chicago, Ill: National Safety Council, 1957.
Lua MLA (8ú heag.)Não informado. Traffic Safety. National Safety Council, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.