Yuwono, Muhammad Ridlo, and Muhammad Wahid Syaifuddin. “Pengembangan Problem Based Learning Dengan Assessment for Learning Berbantuan Smartphone Dalam Pembelajaran Matematika”. Beta: Jurnal Tadris Matematika 10, no. 2 (November 24, 2017): 184–202. Accessed September 25, 2021. https://jurnalbeta.ac.id/index.php/betaJTM/article/view/116.