Cunard, R. A. (1990). Maintenance management of street and highway signs. Transportation Research Board, National Research Council.
Lua i Stíl Chicago (17ú heag.)Cunard, Richard A. Maintenance Management of Street and Highway Signs. Washington, D.C: Transportation Research Board, National Research Council, 1990.
Lua MLA (9ú heag.)Cunard, Richard A. Maintenance Management of Street and Highway Signs. Transportation Research Board, National Research Council, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.