Ato’illah, Mohammad. “Implementasi Lean Six Sigma Dalam Penentuan Prioritas Perbaikan Kualitas Pelayanan Padarumah Sakit Di Kabupaten Lumajang”. Wiga : Jurnal Penelitian Ilmu Ekonomi 7, no. 2 (December 12, 2018): 97–107. Accessed August 29, 2025. http://178.128.120.64/index.php/wiga/article/view/338.