Valen, Andri, and Tio Gusti Satria. “Analisis Tingkat Kesulitan Soal PAS (Penilaian Akhir Semester) Mata Pelajaran IPS Di Sekolah Dasar”. Jurnal Basicedu 5, no. 4 (July 15, 2021): 2199–2208. Accessed July 22, 2024. https://jbasic.org/index.php/basicedu/article/view/1149.