1. Delozier, H.L., Sofferman, R.A. (1986): Pyriform sinus fistula: An unusual cause of recurrent retropharyngeal abscess and cellutitis. Annuals of otorhinolaryngology 95: 377–382.
2. Hiroshi Yamashita, Takkaki Noguchi, Mesahiro Takahashi (1995): Recurrent Cervical abscess and pyriform sinus fistula Journals of laryngology and otology Vol. 109.
3. Michaqel S. Godin, Donald B. Kearns, Seth M. Pransky (1990): Fourth Branchial Pouch Sinus Principles of Diagnosis and Management: Laryngoscope 100.
4. Miller, D., Hill, J.L., Chen-chin, S, et al (1983): The Diagnosis and management of pyriform sinus fistula in infants and young children. Journal of pediatric surgery 18 (4): 337–381.
5. Miyauchi A., Matsuzuka, F. Takai, Kimura, K. Kosaki: Pyriform sinus fistula: A route of infection in acute suppurative thyroiditis. Archives of Surgery 116: 66–69.