Astutik, Endah, and Syamsu Hadi. “PENINGKATAN KEMAMPUAN PEMAHAMAN KONSEP SISTEM EKONOMI DAN HASIL BELAJAR MELALUI MODEL PROBLEM BASED-INSTRUCTION (PBI) SISWA KELAS X IS 5 MAN KEBUMEN 1”. Economic Education Analysis Journal 4, no. 1 (March 23, 2015). Accessed November 25, 2024. https://journal.unnes.ac.id/sju/eeaj/article/view/4726.