Stubbs, P. C., Tyson, W. J., & Dalvi, Q. (1980). Transport economics. G. Allen & Unwin.
Cita Chicago (17th ed.)Stubbs, P. C., W. J. Tyson, i Quasim Dalvi. Transport Economics. London ; Boston: G. Allen & Unwin, 1980.
Cita MLA (9th ed.)Stubbs, P. C., et al. Transport Economics. G. Allen & Unwin, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.