1. Cohnheim, J.: Lectures on General Pathology (English translation), 1889.
2. Goodall, J. W. D.: Early ambulation: A survey of hospital practice. Lancet.1: 43, 1951.
3. Jones, E. G.: A physiological approach to gynecologic problems of incontinence and pelvic support. Univ. South. California M. Bull Vol. 3, no. 4, July, 1951.
4. Kegel, A. H.: The physiologic treatment on poor tone and function of the genital muscles and of urinary stress incontinence. West. J. Surg.57: 527, 1949.
5. Kegel, A. H.: Early genital relaxation: New technic of diagnosis and nonsurgical treatment. Obst. & Gynec.8: 545, 1956.