“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”, JoH, vol. 12, no. 1, pp. 060–068, Aug. 2025, doi: 10.30590/joh.v12n1.1002.