Dian Ratna Puri, Nathanael Sitanggang and Joharis Lubis 2021. Changes in Organizational Culture of UISU Private Sma Pematangsiantar. International Journal of Educational Research & Social Sciences . 2, 6 (Dec. 2021), 1325–1330. DOI:https://doi.org/10.51601/ijersc.v2i6.202.