Purnawati, R. et al. 2026. Integrating the Ethno-STEAM-Based Si PURI Worksheet to Foster Critical Thinking Skills among Fourth-Grade Elementary School Students in Indonesia . Journal of Learning Improvement and Lesson Study. 6, 1 (Jun. 2026), 149–167. DOI:https://doi.org/10.24036/jlils.v6i1.222.