Syutaridho, Syutaridho. “PENGEMBANGAN SOAL OPEN ENDED PADA POKOK BAHASAN PYTHAGORAS”. Jurnal Pendidikan Matematika RAFA, vol. 1, no. 1, May 2017, pp. 117-38, https://jurnal.radenfatah.ac.id/index.php/jpmrafa/article/view/1227.