Crisologo, E. M., et al. “The Effectiveness of Multimedia on the Academic Performance of Grade 5 Teachers in San Bartolome Elementary School”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 1, no. 1, Apr. 2019, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1203.