Manurung, J. L., N. M. Hutapea, and E. Suanto. “Analysis of Mathematical Critical Thinking Ability of Junior High School Students in Solving Problems on Two-Variable Linear Equation System”. Jurnal Gantang, vol. 9, no. 1, Oct. 2024, pp. 19-26, doi:10.31629/jg.v9i1.6925.