Samad, Pratiwi, and Nirma Paris. “A STUDY ON EFL LEARNERS’ ABILITY IN USING IRREGULER VERB THROUGH JOHNNY GRAMMAR WORD CHALLENGE APPLICATION”. INDOPEDIA (Jurnal Inovasi Pembelajaran dan Pendidikan) 1, no. 2 (June 20, 2023): 360–366. Accessed November 3, 2025. https://indopediajurnal.my.id/index.php/jurnal/article/view/44.