Stubbs, P. C., Tyson, W. J., & Dalvi, Q. (1980). Transport economics. G. Allen & Unwin.
Lua i Stíl Chicago (17ú heag.)Stubbs, P. C., W. J. Tyson, agus Quasim Dalvi. Transport Economics. London ; Boston: G. Allen & Unwin, 1980.
Lua MLA (9ú heag.)Stubbs, P. C., et al. Transport Economics. G. Allen & Unwin, 1980.
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