Siregar, A. U., A. Lubis, A. Darmana, and R. D. Suyanti. “Analysis of Student Cognitive Ability Using The K-Means Cluster and Rasch Model (Winsteps) on Chemical Materials through Zoom Meeting”. Jurnal Komunikasi Pendidikan, vol. 6, no. 2, July 2022, pp. 91-101, doi:10.32585/jkp.v6i2.2474.