Wilkins, H. A., & Riley, B. S. (1982). The road grip of commercial vehicle tyres. Transport and Road Research Laboratory.
Lua i Stíl Chicago (17ú heag.)Wilkins, H. A., agus B. S. Riley. The Road Grip of Commercial Vehicle Tyres. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1982.
Lua MLA (9ú heag.)Wilkins, H. A., agus B. S. Riley. The Road Grip of Commercial Vehicle Tyres. Transport and Road Research Laboratory, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.