Tyas, L., Harjana, H. and Wahyuningsih, D. (2021) “Need Analysis for the Development of STEM-PjBL Physics Teaching Materials to Improve Students’ Problem Solving Ability in the 21st Century”, International Journal of English Literature and Social Sciences (IJELS), 6(1). Available at: https://journal-repository.com/index.php/ijels/article/view/3235 (Accessed: 22 July 2024).