Thongtip, N., Lorsanyaluck, B., Sukmak, M., Chaichanathong, S., Thengchaisri, N., Sunyathitiseree, P. and Wajjwalku, W. 2013. Surgical Removal of Urethral and Bladder Stones in Female Asian Elephant (Elephas maximus) by Episiotomy and Urethrotomy. The Thai Journal of Veterinary Medicine. 43, 3 (Oct. 2013), 375–382.