Kurniawan, L. B., U. Bahrun, F. Mangarengi, D. E. R, and M. Arif. “Blood Urea Nitrogen As a Predictor of Mortality in Myocardial Infarction”. Universa Medicina, vol. 32, no. 3, Dec. 2013, pp. 172-8, doi:10.18051/UnivMed.2013.v32.172-178.