Romano, Bettymae, et al. “Assessment on Level of Effectiveness of Using Audio-Visuals in Teaching Science”. 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/1679.