1. Williams Obstetrics;Eastman,1950
2. Clinical Obstetrics;Bishop,1953
3. Roentgenologic Diagnosis of Placenta Praevia;Ude;Am. J. Obst. & Gynec.,1935
4. The Conservative Management of Some Varieties of Placenta Praevia;Johnson;Am. J. Obst. & Gynec.,1945
5. Placenta Praevia-Study of 174 Cases;Macafee;J. Obstet. & Gynaec. Brit. Emp.,1945