Wondwosen Teshome B. ,  Opposition Parties and the Politics of Opposition in Africa: A Critical Analysis.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 1624 - 1638
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/315.