Made Wahyu Sudrajad, I, et al. “The Relationship Between Professional Competence and Productivity and Its Impacts on Teachers’ Job Satisfaction at Junior High School Rawajitu Timur Lampung”. International Journal of Engineering & Technology, vol. 7, no. 3.30, Aug. 2018, pp. 453-7, https://doi.org/10.14419/ijet.v7i3.30.18358.