Salsabella, Ainun, and Titin Aryani. “Sigma Matrix of Ureum and Creatinine in Some Laboratories: Overview: Gambaran Matrik Sigma Pemeriksaan Ureum Dan Kreatinin Pada Beberapa Laboratorium”. Medicra (Journal of Medical Laboratory Science/Technology) 5, no. 1 (July 31, 2022): 40–46. Accessed August 3, 2025. https://medicra.umsida.ac.id/index.php/medicra/article/view/1628.