Haryanti SS, Herlina K, Abdurrahman A. The learning program validity of using the ExPRession model to stimulate students’ systems thinking and numeracy skills. Momentum: Physics Education Journal [Internet]. 2023 Jan. 31 [cited 2024 May 17];7(1):164-77. Available from: https://ejournal.unikama.ac.id/index.php/momentum/article/view/8096