Nudia, & Ainun. (2018). The Effect of Using English Slang Words on Students’ Speaking Skill Of The Year 2018/2019 Tenth Grade Students Of Sma Negeri 1 Hinai Kabupaten Langkat. Serunai : Jurnal Ilmiah Ilmu Pendidikan, 3(2), 108–118. Retrieved from https://www.ejournal.stkipbudidaya.ac.id/index.php/serunai/article/view/33