1. The clinical anatomy and physiology of the nose and accessory sinuses;Ballenger,1985
2. Foreign bodies in the nasal cavity;Baluyot,1980
3. Rhinolith perforating the hard palate;Bicknell;J Laryngol,1970
4. Foreign bodies and nasal carriers of diphtheria;Burton;Lancet,1929
5. Factitious rhinolith;Damm;Oral Surg Oral Med Oral Pathol,1985