MELINDA V. VALIDITAS PERANGKAT PEMBELAJARAN MODEL PROBLEM BASED LEARNING PADA MATERI TEORI KINETIK GAS. ipf [Internet]. 2020 Jan. 16 [cited 2025 Jul. 5];9(1). Available from: https://ejournal.unesa.ac.id/index.php/inovasi-pendidikan-fisika/article/view/31712