Nisyak, Rahmatun, et al. “The Effect of Using Jumbled Letter Game Toward Students’ Vocabulary Mastery at MTs Terpadu Guguak Randah”. Jurnal Pendidikan Tambusai, vol. 9, no. 1, Jan. 2025, pp. 2972-7, http://jptam.org/index.php/jptam/article/view/24748.