Dawson, R. F. F., & Vass, P. (1974). Vehicle operating costs in 1973. Transport and Road Research Laboratory.
Lua i Stíl Chicago (17ú heag.)Dawson, R. F. F., agus P. Vass. Vehicle Operating Costs in 1973. Crowthorne, Eng: Transport and Road Research Laboratory, 1974.
Lua MLA (9ú heag.)Dawson, R. F. F., agus P. Vass. Vehicle Operating Costs in 1973. Transport and Road Research Laboratory, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.