Lumbantobing, L. F., Simanjuntak, G. . G., Sinaga, L. ., Hutajulu, D. ., Saragih, P. S., Sinaga, M. N., & Napitupulu, S. . (2022). AN ANALYSIS ON SPEAKING PROBLEMS IN SMP NEGERI 3 PEMATANG SIANTAR. KOLONI, 1(4), 109–114. https://doi.org/10.31004/koloni.v1i4.276