Bakri, Rina Asrini, Saiful Saiful, Hamid Ismail, Nur Aeni, and St. Asriati AM. 2021. “The Power of Instructional Materials in Teaching Students’ Speaking Skill”. Celebes Journal of Language Studies 1 (1), 77-87. http://harpressid.com/index.php/CJLS/article/view/38.