Khadijah, Ijah. “The Competency of Science Teachers in Implementation of Online Learning In Covid-19 Pandemic Period at SMPN 2 Kramatwatu Serang”. Bulletin of Science Education 1, no. 1 (January 18, 2021): 67–79. Accessed July 1, 2026. https://attractivejournal.com/index.php/bse/article/view/110.