Pengaruh Model Problem Based Learning Terhadap Kemampuan Komunikasi Matematis Ditinjau dari Self Efficacy Siswa SMA Negeri 6 Kendari Iqbal Pratama, Lambertus Lambertus, Busnawir Busnawir Jurnal Pembelajaran Berpikir Matematika (Journal of Mathematics Thinking Learning) Vol. 8 No. 1 2023 DOI 10.33772/jpbm.v8i1.42776