“Analisis Quality Control Internal Pemeriksaan Sgot Dan Sgpt Menggunakan Grafik Levey-Jennings dan Six Sigma Di RS X Yogyakarta: Internal Quality Control Analysis of Sgot and Sgpt Examination Using Levey-Jennings Graphics and Six Sigma at X Hospital Yogyakarta”. Journal of Health 12, no. 1 (August 14, 2025): 060–068. Accessed May 4, 2026. https://journal.gunabangsa.ac.id/joh/article/view/92.