1. Effect of tympanic membrane perforation on middle-ear sound transmission;Matsuda Y;J Laryngol Otol Suppl,2009
2. Treatment of otitis media with perforated tympanic membrane;Wright D;Am Fam Physician,2009
3. Chronic suppurative otitis media (CSOM). (2016). Accessed. March 07, 2020: https://gpnotebook.com/simplepage.cfm?ID=-435814389.
4. Chronic suppurative otitis media: a review;Verhoeff M;Int J Pediatr Otorhinolaryngol,2006
5. Chronic suppurative otitis media. clinical features and diagnosis. (2018). Accessed: April 07, 2020: https://www.uptodate.com/contents/chronic-suppurative-otitis-media-csom-clinical-features-and-diagnosis#H1499469691.