1. Jackson C. (1979): Foreign bodies in air and food passage. In: English GM, ed. Otolatyngology. Hagerstown: Harper & Row, 1 -94.
2. Nandi P, Ong GB. (1978): Foreign body in the oesophagus: review of 2394 cases. Br J Surg 65: 5 - 9..
3. Giordano A, Adams G, Bories L, Meyerhoof W, (1981): Current management of esophageal foreign bodies. Arch otolaryngol 107: 249- 51.
4. Goldsher M, Eliachar I, Joachims HZ. (1978): Paradoxical presentation in children of foreign bodies in trachea and oesophagus. Practitioner, 220: 631 - 32.
5. Choen SR.(1981): Unusual presentation and problems created by mismanagement of foreign body in the aerodigestive tract of the patient. Ann Otol 90: 316 - 22.