Nicholas Kyriazis and  Emmanouil Marios L. Economou and  Jr and  Loukas Zachilas,  Direct Democracy and Social Contract in Ancient Athens.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2012, vol. 71(11). 3086 - 3091
    [viewed 13 December 2019]. Available from: https://publications.waset.org/pdf/5579.