SIANTURI, A.; SIPAYUNG, T. N.; SIMORANGKIR, F. M. A. Pengaruh Model Problem Based Learning (PBL) Terhadap Kemampuan Berpikir Kritis Matematis Siswa SMPN 5 Sumbul. Union : Jurnal Ilmiah Pendidikan Matematika, [S. l.], v. 6, n. 1, 2018. DOI: 10.30738/.v6i1.2082. Disponível em: https://jurnal.ustjogja.ac.id/index.php/union/article/view/2082. Acesso em: 28 sep. 2022.