WASET
    Martin Henkel,  Interaction at a Distance – An Approach for Redesigning for Distance Education.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2012, vol. 65(5). 806 - 812
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/5483.