Sagala, Prihatin Ningsih, and Yunita Eunike Maduma. 2017. “IMPROVING MATHEMATICAL PROBLEM SOLVING CAPABILITY THROUGH A REALISTIC MATHEMATICAL APPROACH WITH STAD TYPE COOPERATIVE MODEL”. REKOGNISI : Jurnal Pendidikan Dan Kependidikan (E-ISSN 2599-2260) 2 (2):117-34. https://jurnal.unusu.ac.id/index.php/rekognisi/article/view/70.