Ginting, A. P., D. S. R. . . Simanjuntak, C. R. . . Gultom, and J. . Sihite. “Forms of Affixation Morphological Errors in Speech Texts of Grade VIII Students SMP Swasta Cerdas Bangsa”. Jurnal Pembelajaran Bahasa Dan Sastra, vol. 4, no. 4, Aug. 2025, pp. 881-94, doi:10.55909/jpbs.v4i4.848.