1. Agarwal, S. P., Dayal, D., Sharma, Harsh (1988) : Foreign bodies in Air and Food Passages-a Review of 3 year’s experience.The Indian Practitioner,May : 323.
2. Barret, J. H. (1951): Foreign bodies in air and food passages,Archives of Otolaryngology,54 : 651.
3. Brooks, J. W. (1972): Foreign bodies in air and food passages,Annals of Surgery
175 : 720.
4. Clert, L. H. (1980) Foreign bodies in the air and food passages, Observations on end result in a series of 950 cases.Surg. Obstet. Gynaecol.
70: 328.
5. Dubey, S. K., Munjal, K. R., Mehta, M (1988): Uniovular and Binovular coin foreign bodies of cricopharynxIndian Journal of Otolaryngology,40-2 : 70