Lumbantobing, Ligita Friskila, Gebby Gabriella Simanjuntak, Liska Sinaga, Debora Hutajulu, Pani Santarika Saragih, Monira Noverdita Sinaga, and Selviana Napitupulu. 2022. “AN ANALYSIS ON SPEAKING PROBLEMS IN SMP NEGERI 3 PEMATANG SIANTAR”. KOLONI 1 (4):109-14. https://doi.org/10.31004/koloni.v1i4.276.