Ritonga, B. et al. 2026. Implementasi Problem Based Learning Berbasis Etnosains Pada Materi Pembiasan Cahaya di SD YPK Betfage Kabare. Indonesian Journal of Multidisciplinary on Social and Technology. 4, 2 (Jun. 2026), 2214–2220. DOI:https://doi.org/10.69693/ijmst.v4i2.10319.