Socialization on Improving English Language Skills through TOEFL for Grade 12 Students of SMK Swasta HKBP Pematang Siantar . IKHLAS: Jurnal Pengabdian Dosen dan Mahasiswa, [S. l.], v. 2, n. 3, p. 28–32, 2023. DOI: 10.58707/ikhlas.v2i3.680. Disponível em: https://ejournal.indrainstitute.id/index.php/ikhlas/article/view/680. Acesso em: 13 nov. 2026.