حسين خلف ص. “Sensitivity of Staphylococcus Aureus and Klebsiella Pneumoniae Isolated from Rhinosinusitis Cases towards Some Antibiotics and Their Abilities of β-Lactamase Production”. College of Basic Education Research Journal, vol. 11, no. 4, Dec. 2012, pp. 596-11, https://moss.uomosul.edu.iq/index.php/berj/article/view/39109.