Juan Méndez Vergaray, Edward Flores, C. A. L. U. “The Impact of COVID-19 on the Teaching Work: From Face-to-Face to Virtual”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 6, Apr. 2021, pp. 2125-31, https://www.turcomat.org/index.php/turkbilmat/article/view/4818.