An Analysys Of Vocabulary Mastery Efects On Students’ Speaking Ability In SMA YPK Pematangsiantar. jbl [Internet]. 31 Oktober 2023 [dikutip 23 Februari 2026];5(2):180 – 186. Tersedia pada: https://jurnal.usi.ac.id/index.php/jbl/article/view/1042