Purnawati, Ririn, et al. “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, vol. 6, no. 1, June 2026, pp. 149-67, doi:10.24036/jlils.v6i1.222.