Syarifuddin, E. . Harapan, and D. . Wardiah. “Implementation of Teacher Certification in Improving Teacher Performance in 1 Rambutan Junior High School”. Jurnal Pendidikan Tambusai, vol. 5, no. 3, Aug. 2021, pp. 5717-22, doi:10.31004/jptam.v5i3.1796.