WASET
    Dubbale Daniel A. and  Tsutsumi J. and  Michael J. Bendewald,  Urban Environmental Challenges in Developing Cities: The Case of Ethiopian Capital Addis Ababa.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 164 - 169
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/12541.