WASET
    Amira Mabrouk and  Chokri Abdennadher,  Estimation of Time Loss and Costs of Traffic Congestion: The Contingent Valuation Method.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 111(3). 702 - 706
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/10003752.