YUNITA PRIMASANTI; BEKTI NUGRAHADI; INDAH WAHYU. PENERAPAN SIX SIGMA DALAM UPAYA PENURUAN ADUAN BRT TRANS JATENG KORIDOR 7 . JURNAL ILMIAH EDUNOMIKA, [S. l.], v. 9, n. 4, 2025. DOI: 10.29040/jie.v9i4.18790. Disponível em: https://jurnal.stie-aas.ac.id/index.php/jie/article/view/18790. Acesso em: 12 feb. 2026.