Haryanti, S.S., Herlina, K. and Abdurrahman, A. 2023. The learning program validity of using the ExPRession model to stimulate students’ systems thinking and numeracy skills. Momentum: Physics Education Journal. 7, 1 (Jan. 2023), 164–177. DOI:https://doi.org/10.21067/mpej.v7i1.8096.