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- Orndoff, B. H.: Pneumoperitoneum. J. Roentgenol. 2: 265, 1919.
- Stewart, W. H. and Stein, A.: Roentgen ray study of abdominal organs following oxygen inflation of peritoneal cavity. Am. J. Roentgenol. 6: 533, 1919.
- Van Zwaluwenburg, J. G. and Peterson, R.: Pneumoperitoneum of pelvis; gynecological studies. Am. J. Roentgenol. 8: 12, 1921.
- Alvarez, W. C.: Use of CO2 in pneumoperitoneum. Ibid.,3 p. 71.
- Case, J. T.: Review of three years' work and articles on pneumoperitoneum. Ibid.,3 p. 714.
- Stein, I. F. and Arens, R. A.: Pneumoperitoneum in gynecology. Radiology 7: 326, 1926.
- Peterson, R.: Value of pneumoperitoneal roentgenography in obstetrics and gynecology. J.A.M.A. 78: 397, 1922.
- Lewis, B. O.: Simplified apparatus for induction of pneumoperitoneum. Am. J. M. Sc. 211: 84, 1946.
- Sante, L. R.: Present status of pneumoperitoneum as an aid in radiological diagnosis of abdominal lesions. Southwestern Med. 11: 529, 1927.
- Faulkner, W. B., Jr.: Diaphragmatic hernia and eventration: Use of pneumothorax in differential diagnosis. Am. J. Roentgenol. 45: 72, 1941.
- Martin, C. L.: Roentgenologic studies of liver and spleen. Am. J. Roentgenol. 37: 633, 1937.
- Rubin, I. C.: Subphrenic pneumoperitoneum produced by intrauterine insufflation of oxygen as test of patency of fallopian tubes in sterility and in allied gynecological conditions. Ibid.,3 p. 120.
- Stein, I. F.: Gynecography in the diagnosis of ovarian disorders. In Soskin, S. (Editor): Progress in Clinical Endocrinology. New York and London, Grune & Stratton, Inc., 1950, p. 374.
- Maxfield, J. R., Jr. and McIlwain, A. J.: Diagnostic value of pneumoperitoneum. Radiology 42: 346, 1944.
- Maxfield, J. R., Jr.: Pneumoperitoneum in the study of pelvic structures. J.A.M.A. 146: 920, 1951.
- Kunstadter, R. H., Guterman, H. S. and Tulsky, A.: Transabdominal pneumoperitoneum as an aid in the diagnosis of sex endocrine disturbances. A.M.A. J. Dis. Child. 86: 275, 1953.
- Kunstadter, R. H. and Tulsky, A.: Diagnostic transabdominal pneumoperitoneum in children. Am. J. Obst. & Gynec. 68: 819, 1954.
- Franaman, S. L.: Diagnostic pneumoperitoneum. M. Tribune, March 5, 1962, p. 10.
- Wilkins, L.: The Diagnosis and Treatment of Endocrine Disorders in Childhood and Adolescence. Springfield, Illinois, Charles C Thomas, 1957.
- Stein, I. F. and Arens, R. A.: A table for gynecography. Am. J. Obst. & Gynec. 63: 1169, 1952.