Khoirunnisa, K., and S. Supriyono. “Boosting Students Grammar Achievement Applying Johnny Grammar Word Challenge Application In Senior High School”. Cendikia: Jurnal Pendidikan Dan Pengajaran, vol. 2, no. 11, Sept. 2024, pp. 80-82, https://jurnal.kolibi.org/index.php/cendikia/article/view/3717.