Ellok Rini Widyaning. 2019. “Analisis Kesalahan Menyelesaikan Soal Cerita Siswa Kelas VIII Materi Sistem Persamaan Linier Dua Variabel Di SMP PGRI Sumobito”. Journal Focus Action of Research Mathematic (Factor M) 2 (1):1-14. https://doi.org/10.30762/factor_m.v2i1.1682.