Winingsih, L. H. ., Agung, I. ., & Sulistiono, A. A. . (2019). The Influence of Government Policy, Principle Leadership, and Participation of Parents on Strengthening Teacher Organizations (KKG/MGMP) and Development of Problem Solving in Students: Indonesia Case. International Journal of Education and Practice, 7(4), 479–493. https://doi.org/10.18488/journal.61.2019.74.479.493