La riproduzione dei rettili: il primo passo è riconoscerne il sesso

Fritz Jürgen Obst, Turtles, tortoises, and terrapins St. Martin's Press. ,(1986)

Timothy J. Evans, Vekataseshu K. Ganjam, Reproductive Anatomy and Physiology Reproductive and Developmental Toxicology. pp. 7- 32 ,(2011) , 10.1016/B978-0-12-382032-7.10002-5

Medicine and surgery of tortoises and turtles Blackwell Pub.. ,(2004) , 10.1002/9780470698877

GIACOMO GNUDI, ANTONELLA VOLTA, FRANCESCO DI IANNI, MATTIA BONAZZI, SABRINA MANFREDI, GIORGIO BERTONI, USE OF ULTRASONOGRAPHY AND CONTRAST RADIOGRAPHY FOR SNAKE GENDER DETERMINATION Veterinary Radiology & Ultrasound. ,vol. 50, pp. 309- 311 ,(2009) , 10.1111/J.1740-8261.2009.01540.X

Paolo Selleri, Nicola Di Girolamo, Raffaele Melidone, Cystoscopic sex identification of posthatchling chelonians Javma-journal of The American Veterinary Medical Association. ,vol. 242, pp. 1744- 1750 ,(2013) , 10.2460/JAVMA.242.12.1744

Winston Card, Arnold G. Kluge, HEMIPENEAL SKELETON AND VARANID LIZARD SYSTEMATICS Journal of Herpetology. ,vol. 29, pp. 275- 280 ,(1995) , 10.2307/1564567