Suganda, Handi, Riandi Riandi, dan Widi Purwianiangsih. “Biology Teacher’s Perception in Accommodating 21st Century Learning Demands”. International Conference on Elementary Education 2, no. 1 (Maret 2, 2020): 103-111. Diakses Mei 19, 2024. http://proceedings.upi.edu/index.php/icee/article/view/611.