N. Nizar Siagian, Muhammad Iqbal, Andysah Putera Utama Siahaan, Darmeli Nasution, and Zulham Sitorus, “Analysis of Civil Servant Teacher Certification Patterns in Asahan Regency Using the C4.5 and Random Forest Algorithm”, ICEEGLOF, pp. 1142–1151, Feb. 2026.