“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, vol. 13, no. 4, Aug. 2024, pp. 153-8, https://doi.org/10.33578/jpfkip-v13i4.p153-158.