Reni Tania, Welven Aida. PENGARUH MODEL PEMBELAJARAN PROBLEM BASED LEARNING TERHADAP KEMAMPUAN BERPIKIR KRITIS SISWA KELAS IX MATA PELAJARAN IPS DI SMP NEGERI 1 BANGUN PURBA. bjsse [Internet]. 2021 Jan. 8 [cited 2024 Dec. 27];1(1):24-33. Available from: https://journal.upp.ac.id/index.php/bakoba/article/view/587