Umiyati, U., K. Kartono, and Y. Yumiati. “Improving Problem-Solving Skills Through the Discovery Learning Model Assisted by Concrete Objects”. Edumaspul: Jurnal Pendidikan, vol. 10, no. 2, July 2026, pp. 554-63, https://jurnal2.unimen.cloud/index.php/edumaspul/article/view/292.