P. Nazwa, R. Rehana, Y. M. Rambe, Y. Aprilia, and B. H. Siregar, “ANALYSIS OF STUDENTS’ PROCEDURAL ERRORS IN SOLVING GEOMETRIC TRANSFORMATION PROBLEMS BASED ON PROCEDURAL FLUENCY”, Secondary J. Inov. Pendidik. Menengah, vol. 6, no. 3, pp. 823–833, May 2026.