S. Siahaan, S. . Situmeang, and F. E. Siahaan, “The Speaking Disfluencies in the University Students’ Classroom Conversation”, Int. J. Multidiscip. Appl. Bus. Edu. Res., vol. 4, no. 2, pp. 501–518, Feb. 2023, doi: 10.11594/ijmaber.04.02.18.