Umasugi, Sitti Mutia, et al. “Realistic Mathematics Education (RME)-Based Learning Trajectory for Arithmetic Social Using Culinary Context of Yogyakarta”. Jurnal Kependidikan: Jurnal Hasil Penelitian Dan Kajian Kepustakaan Di Bidang Pendidikan, Pengajaran Dan Pembelajaran, vol. 8, no. 4, Dec. 2022, pp. 985-96, doi:10.33394/jk.v8i4.6176.