Budi Wiyono, Bambang, and Teguh Triwiyanto. “The Effective Development Techniques in Teacher Working Group Meeting to Improve Teacher Professionalism”. International Journal of Engineering and Technology, vol. 7, no. 3.25, Aug. 2018, pp. 295-8, https://doi.org/10.14419/ijet.v7i3.25.17585.