Udi Priyono, Isjoni, and Bunari. 2024. “The Effect of Teacher Professional Certification and Work Motivation on the Performance of Elementary School Teachers in the Kempas District, Indragiri Hilir Regency”. Primary: Jurnal Pendidikan Guru Sekolah Dasar 13 (4): 153-58. https://doi.org/10.33578/jpfkip-v13i4.p153-158.