Kolanjiappan, B., H. Raj, and C. Ramaraj. “Diagnostic Accuracy of Hyperbilirubinemia in Preoperative Diagnosis of Acute Perforated Appendix”. International Surgery Journal, vol. 6, no. 12, Nov. 2019, pp. 4481-4, doi:10.18203/2349-2902.isj20195417.