1. Pediatric X-Ray Diagnosis;Caffey,1961
2. Pneumothorax and pneumomediastinum;Chasler;Am. J. Roentgenol., Rad. Ther. and Nuc. Med.,1964
3. The extrapleural air sign in pneumomediastinum;Lilliard;Radiology,1965
4. Dorland Illustrated Medical Dictionary,1965
5. Fundamentals of Chest Roentgenology;Felson,1963