Amhar, Yusuf, Surya Sari Faradiba, and Zainal Abidin. “ANALISIS TINGKAT KEBERHASILAN: HASIL VALIDASI BUKU TANGKAS MATEMATIKA 14 LEVEL”. HISTOGRAM: Jurnal Pendidikan Matematika 7, no. 2 (September 30, 2023): 133–141. Accessed January 15, 2026. https://journal.matappa.ac.id/index.php/histogram/article/view/3306.