Nasa, H.; Lestari, S. . The Role of School Principals’ Leadership in Improving Teacher Performance at Proskill Health Vocational School Tualang and YPPI Vocational School Tualang, Siak Regency. JES 2025, 9 (6), 6547-6558. https://doi.org/10.31258/jes.9.6.p.6547-6558.