Fera, Nusa, et al. “The Influence of Green Leadership, Emotional Intelligence, and 21st-Century Competence on Teacher Performance at the Sultan Agung Education Foundation in Pematangsiantar”. The International Journal of Advanced Technology and Social Sciences, vol. 4, no. 10, Nov. 2026, pp. 1289-02, doi:10.59890/ijatss.v4i10.3.