Sholihah, Mar'atus, and Edy Nurfalah. “USING THE NEWMAN STAGE TO SOLVE STORY PROBLEMS THE SPACE OF FLAT SIDES”. Jurnal Teladan: Jurnal Ilmu Pendidikan Dan Pembelajaran, vol. 3, no. 2, Nov. 2018, pp. 89-97, http://journal.unirow.ac.id/index.php/teladan/article/view/37.