Nudia, and 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):108-18. https://www.ejournal.stkipbudidaya.ac.id/index.php/serunai/article/view/33.