Ravitch, M. M., & Welch, K. J. (1979). Pediatric surgery: Edited by Mark M. Ravitch (3rd edition.). Year Book Medical Publishers.

Ravitch, Mark M., and Kenneth J. Welch. Pediatric Surgery: Edited by Mark M. Ravitch. 3rd edition. Chicago ; London: Year Book Medical Publishers, 1979.

Ravitch, Mark M., and Kenneth J. Welch. Pediatric Surgery: Edited by Mark M. Ravitch. 3rd edition. Year Book Medical Publishers, 1979.