Anugraheni, Tiara Djati, Lidiyatul Izzah, and Muhamad Sofian Hadi. “Increasing the Students’ Speaking Ability through Role-Playing With Slovin’s Formula Sample Size”. Jurnal Studi Guru dan Pembelajaran 6, no. 3 (December 30, 2023): 262–272. Accessed July 7, 2025. https://www.e-journal.my.id/jsgp/article/view/2825.