Hensher,David A. (1977). Urban transport economics. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Hensher,David A. Urban Transport Economics. London: Cambridge University Press, 1977.
Lua MLA (9ú heag.)Hensher,David A. Urban Transport Economics. Cambridge University Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.