1. Gunning JE, Rosenzweig BA. Evolution of endoscopic surgery. In: White RA, Klein SR, editors. Endoscopic surgery. St. Louis: Mosby; 1991.
2. Kelly HA. The direct examination of the female bladder with elevated pelvis: the catheterization of the ureters under direct inspection, with and without elevation of the pelvis. Am J Obstet Dis Women Child. 1894;25:1.
3. Shah J. Endoscopy through the ages. BJU Int. 2002;89:645–52.
4. Hopkins HH, Kopany NS. A flexible fiberscope, using static scanning. Nature. 1954;179:30.
5. Yassin MS, Henderson JM, Keely FX. Endoscopy. In: Cardozo L, Staskin D, editors. Textbook of female urology and urogynecology. Boca Raton: CRC Press, Taylor & Francis Group; 2017.