Merry Susanty Br Tarigan, Nava Arbina Br Sembiring and Grace Martha Elvriani Purba 2024. An Analysis of Students’ Vocabulary Mastery at SMP Gajah Mada Medan. International Journal of Integrative Sciences. 3, 1 (Jan. 2024), 17–36. DOI:https://doi.org/10.55927/ijis.v3i1.7600.