T. Simatupang and O. Appulembang, “KEMAMPUAN BERPIKIR KRITIS SISWA KELAS VIII PADA PEMBELAJARAN MATEMATIKA MELALUI MODEL PEMBELAJARAN BERBASIS MASALAH [THE CRITICAL THINKING ABILITIES OF GRADE 8 MATHEMATICS STUDENTS USING THE PROBLEM-BASED LEARNING MODEL]”, JOHME, vol. 6, no. 2, pp. 138–156, Dec. 2022.