Spinosi, M. C., C. Mezzedimi, G. Monciatti, and D. Passali. “Internal Laryngocele: Unusual Onset in a 91-Year-Old Female Patient”. Sultan Qaboos University Medical Journal, vol. 18, no. 1, Apr. 2018, pp. e104-106, doi:10.18295/squmj.2018.18.01.018.