1. Murphy L (1964) Leonardo da Vinci and the anatomy of the genitourinary system. Med J Aust 11: 556–560
2. Belt E (1965) Leonardo the Florentine (1452–1519). Invest Urol 3: 99–109
3. Schutte H, Herman JR (1979) Urogenital drawings by Leonardo da Vinci. N Y State J Med 79: 402–405
4. Morris AG (1986) On the sexual intercourse drawings of Leonardo da Vinci. S Afr Med J 69: 510–513
5. Clark K. A (1935) Catalogue of the Drawings of Leonardo da Vinci in the Collection of His Majesty the King at Windsor Castle. University Press, Cambridge