Sukmawati, T.N. et al. 2021. Analysis of Problem Solving Ability Judging from the Ethnicity of Junior High School Students on Social Arithmetic Materials in Singkawang City West Kalimantan. Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran. 7, 4 (Dec. 2021), 968–980. DOI:https://doi.org/10.33394/jk.v7i4.3920.