1. Radionuclide lung scanning in the diagnosis of endobronchial foreign bodies in children
2. Bunker, P.G.: Practical points about detecting and removing foreign bodies, Consultant, September 1965, p. 30.
3. National Safety Council: Accident facts. Chicago, The National Safety Council, 1969, pp. 12 and 81.
4. Jackson, C., and Jackson, C.L.: Diseases of the air and Food Passages of Foreign Body Origin. Philadelphia, W. B. Saunders Co., 1907, pp. 30-38.