Nurmukhambetov Ardak,  Social Aggravations during the Period of Medieval Wars in Europe.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2012, vol. 65(5). 915 - 918
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/654.