Wahyono P, Azizah SN. The effect of servant leadership and non-physical work environment on employee performance with motivation as mediation at the nusakambangan open correctional institution . Mantik [Internet]. 2026Feb.28 [cited 2026Apr.17];9(4):1245-53. Available from: https://www.iocscience.org/ejournal/index.php/mantik/article/view/6979