Ayson, Patricia N., Jan Eero G. Lopez, and Erasmo Gonzalo DV. Llanes. 2006. “Chronic Suppurative Otitis Media: Bacteriology and Drug Sensitivity Patterns at the Quirino Memorial Medical Center (2004-2005): A Preliminary Study”. Philippine Journal of Otolaryngology Head and Neck Surgery 21 (1-2):20-23. https://doi.org/10.32412/pjohns.v21i1-2.823.