Tanjung WA, Suparni, Hasibuan NAP. Development and Preliminary Validation of a Problem-Based Learning–Oriented Science Assessment Instrument on Changes in the State of Matter for Grade 4 Students. PASSIKOLA [Internet]. 2026 Jul. 12 [cited 2026 Sep. 6];3(1):60-8. Available from: https://www.jurnal.stainmajene.ac.id/index.php/pgmi/article/view/2073