PurwaningsihDatik, Sukiyanto, and Pardimin. 2025. “Developing Smart Nusantara Stairs Media Based On PBL As A Strategy To Improve Addition And Subtraction Learning Outcomes Of Grade 1 Elementary School Students”. International Conference on Elementary Education 7 (1). Bandung, Indonesia, 160-71. http://proceedings2.upi.edu/index.php/icee/article/view/4056.