Nasution, Leni Masnidar. “Dasar Statistika”. Al-Fikru: Jurnal Ilmiah 13, no. 2 (May 3, 2021): 141–145. Accessed December 5, 2025. http://jurnal.staiserdanglubukpakam.ac.id/index.php/alfikru/article/view/18.