Sulma Hajijatur Ridlwana, Arifiani Agustin Amalia, and Yeni Rahmawati. “Internal Quality Control Analysis of Sgot and Sgpt Examination Using Levey-Jennings Graphics and Six Sigma at X Hospital Yogyakarta: Analisis Quality Control Internal Pemeriksaan Sgot Dan Sgpt Menggunakan Grafik Levey-Jennings Dan Six Sigma Di RS X Yogyakarta”. Journal of Health (JoH) 12, no. 1 (January 23, 2025): 060-068. Accessed February 2, 2025. https://journal.gunabangsa.ac.id/index.php/joh/article/view/1002.