Agah Tu─črul Korucu and  Handan Atun,  The Cloud Systems Used in Education: Properties and Overview.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 112(4). 1400 - 1404
    [viewed 06 July 2020]. Available from: https://publications.waset.org/pdf/10007118.