Dian Ratna Puri, Nathanael Sitanggang, and Joharis Lubis. “Changes in Organizational Culture of UISU Private Sma Pematangsiantar”. International Journal of Educational Research &Amp; Social Sciences, vol. 2, no. 6, Dec. 2021, pp. 1325-30, doi:10.51601/ijersc.v2i6.202.