Investigating The English Speaking Skill Of The Eleventh Grade Students Of Smk Swasta 2 Tamansiswa Pematang Siantar By Using Tedxtalks Youtube channel. jbl [Internet]. 31 Oktober 2023 [dikutip 21 November 2025];5(2):138 – 144. Tersedia pada: https://jurnal.usi.ac.id/index.php/jbl/article/view/1036