WASET
    Jamaa Salih and  Francis Edum-Fotwe and  Andrew Price,  Investigating the Road Maintenance Performance in Developing Countries.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 112(4). 472 - 476
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/10004106.