Nasr, A., and N. Shawky. “Educational Opportunities for the Crisis of Corona Virus (COVID-19) From the Viewpoint of the Students of Hafar Al-Batin University”. International Journal of Research in Educational Sciences., Vol. 4, no. 2, Mar. 2021, pp. 353 -93, https://iafh.net/index.php/IJRES/article/view/264.