Martanto, Siswo, Suwito Pramono, and Tjaturrahono Sanjoto. “The Implementation of Blended Learning in Social Studies Learning for 21st Century Skills Enhancement”. JESS (Journal of Educational Social Studies) 10, no. 1 (June 30, 2021): 9-18. Accessed November 22, 2024. https://journal.unnes.ac.id/sju/jess/article/view/44502.