Arief Ramadhanus, Willy, et al. “Analisis Pengaruh Implementasi Lean & Six Sigma Terhadap Kinerja Operasional Pada Perusahaan Manufaktur XYZ”. Journal of Accounting and Finance Management, vol. 6, no. 4, Oct. 2025, pp. 2267-74, doi:10.38035/jafm.v6i4.2529.