Carrillo, R. J. C., N. W. Yang, and G. T. Abes. “Relationship of Pure Tone Audiometry and Ossicular Discontinuity in Chronic Suppurative Otitis Media”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 21, no. 1-2, Nov. 2006, pp. 5-10, doi:10.32412/pjohns.v21i1-2.819.