Penerapan Model Problem Based Learning (PBL) Dalam Peningkatan Pemahaman Wujud Zat dan Perubahannya (Studi Kasus Kelas IV MI Muhammadiyah Blangpidie). Validitas [Internet]. 2025 Jun. 30 [cited 2025 Dec. 11];1(2):213-22. Available from: https://journal.maysapublishing.com/index.php/Validitas/article/view/249