Widianti, Yuli, and Ina Agustin. “PENGEMBANGAN MEDIA ULAR TANGA BERBASIS VISUAL MENINGKATKAN KEMAMPUAN MENGENAL BANGUN DATAR SISWA TUNAGRAHITA KELAS III”. Prosiding SNasPPM, vol. 7, no. 2, Jan. 2023, pp. 1254-61, http://prosiding.unirow.ac.id/index.php/SNasPPM/article/view/1395.