Indrapangastuti, Dewi, Herman Dwi Surjono, Sugiman ., and Bagus Endri Yanto. 2021. “Effectiveness of the Blended Learning Model to Improve Students’ Achievement of Mathematical Concepts”. Journal of Education and E-Learning Research 8 (4):423-30. https://doi.org/10.20448/journal.509.2021.84.423.430.