Valen A, Satria TG. Analisis Tingkat Kesulitan Soal PAS (Penilaian Akhir Semester) Mata Pelajaran IPS di Sekolah Dasar. basicedu [Internet]. 2021 Jul. 15 [cited 2026 Jan. 27];5(4):2199-208. Available from: https://www.jbasic.org/index.php/basicedu/article/view/1149