Sekarini, Assa Prima, Wiyanto Wiyanto, and Ellianawati Ellianawati. “Analysis of Problem Based Learning Model With Mind Mapping to Increase 21st Century Skills”. Journal of Innovative Science Education 9, no. 3 (December 7, 2020): 321 - 326. Accessed November 24, 2024. https://journal.unnes.ac.id/sju/jise/article/view/36843.