Sitorus, Jonni. “SUMBERDAYA MANUSIA GURU SMP DALAM RANGKA PENINGKATAN MUTU PENDIDIKAN (HUMAN RESOURCES OF JUNIOR HIGH SCHOOL TEACHER FOR IMPROVING THE EDUCATION QUALITY)”. Inovasi, vol. 14, no. 1, Aug. 2018, pp. 28-34, http://jurnal.bappelitbang.sumutprov.go.id/index.php/inovasi/article/view/84.