Pekka Makkonen and  Georgios Lampropoulos and  Kerstin Siakas,  Effect of Social Media on Knowledge Work.   journal   = {International Journal of Social and Business Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2020, vol. 168(12). 1274 - 1280
    [viewed 26 October 2021]. Available from: https://publications.waset.org/pdf/10011689.