Mukhtar, Hidayat, and Alef Meichaty. 2020. “EFFECTIVENESS OF TEACHER CERTIFICATION IN IMPROVING SERVICE PROFESSIONAL SERVICE IN MADRASAH ALIYAH STATE OF JAMBI PROVINCE”. International Journal of Research -GRANTHAALAYAH 7 (12):292-314. https://doi.org/10.29121/granthaalayah.v7.i12.2019.323.