1. Jackson C, Jackson CL.Diseases of the Nose, Throat and Ear. 2nd ed. London, WB Saunders Company 1959, p 34.
2. Yadav SPS, Goel HC, Choudhary D, Jain L. Marble in the nasopharynx.Indian Pediatr 1991; 28: 183–184.
3. Ransome J. Foreign Bodies in the Nose. In: Kerr AG, Groves J, eds.Scott Brown's Otolaryngology, 5th ed. London, Butter-worth and Co Ltd. 1987; Vol. 6, 276–279.
4. Birrell JF.Paediatric Otolaryngology John Wright, Ist ed. Bristol 1978; p 6.
5. Beg MH, Reyazuddin. Esophageal Foreign Body: An unusual presentation.Indian Pediatr 1988; 25: 464–466.