Cahyaningtyas, O., R. Rahardi, and S. Irawati. “Analysis of Student’s Errors in Solving Equality and Inequality Absolute Value Problems Based on Newman’s Theory”. Edumatica : Jurnal Pendidikan Matematika, vol. 11, no. 03, Dec. 2021, pp. 104-17, doi:10.22437/edumatica.v11i03.14201.