Afif Norma Lidya, and Endang Istikomah. “POWTOON-BASED MATHEMATICS LEARNING MEDIA: VALIDATION STAGE OF THE PYTHAGOREAN THEOREM”. Mathematics Research and Education Journal, vol. 5, no. 1, Feb. 2021, pp. 1-7, doi:10.25299/mrej.2021.vol5(1).9206.