Tyler, J. W. (1979). TRRL quiet vehicle programme: Quiet heavy vehicle (QHV) project. Transport and Road Research Laboratory.
Lua i Stíl Chicago (17ú heag.)Tyler, J. W. TRRL Quiet Vehicle Programme: Quiet Heavy Vehicle (QHV) Project. Crowthorne, Berk: Transport and Road Research Laboratory, 1979.
Lua MLA (9ú heag.)Tyler, J. W. TRRL Quiet Vehicle Programme: Quiet Heavy Vehicle (QHV) Project. Transport and Road Research Laboratory, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.