Nasra, E., Etika, S., Kurniawaty, D., Bahrizal, B. and Yusmaita, E. (2019) “Improvement of MGMP Chemistry Teacher Competency in 50-Kota Districts on OSN Preparing Students”, Pelita Eksakta, 2(2), pp. 134-139. doi: 10.24036/pelitaeksakta/vol2-iss2/46.