Hidayat, Praba Wahyu, Sri Mulyani Endang Susilowati, and Ellianawati Ellianawati. 2019. “Analysis of Problem-Solving Abilities of Elementary School Students Through Problem-Based Learning Model Based on Self Confidence”. Journal of Primary Education 8 (4), 8-15. https://journal.unnes.ac.id/sju/jpe/article/view/28237.