Wibowo Kurniawan, A., and M. Iqbal Tawakal. “Survey on the Effectiveness of Online Learning Processes Due to the Coronavirus (Covid-19) Pandemic in Table Tennis Course”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, vol. 8, no. 3, Nov. 2022, pp. 119-35, doi:10.29407/js_unpgri.v8i3.18897.