LUMBANTOBING, L. F.; SIMANJUNTAK, G. . G.; SINAGA, L. .; HUTAJULU, D. .; SARAGIH, P. S.; SINAGA, M. N.; NAPITUPULU, S. . AN ANALYSIS ON SPEAKING PROBLEMS IN SMP NEGERI 3 PEMATANG SIANTAR. KOLONI, [S. l.], v. 1, n. 4, p. 109–114, 2022. DOI: 10.31004/koloni.v1i4.276. Disponível em: https://koloni.or.id/index.php/koloni/article/view/276. Acesso em: 25 may. 2026.