Rada, December, et al. “Effectiveness of Multimedia in Teaching Performance of Grade 3 Teachers at Caloocan North Elementary School”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 2, no. 1, Apr. 2020, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1677.