Cao, L., Que, R., Zhou, F., Ding, G., & Jing, D. (2011). Transumbilical single-port laparoscopic cholecystectomy using traditional laparoscopic instruments: A report of thirty-six cases. Zhejiang University Press.

Cao, Li-ping, Ri-sheng Que, Fan Zhou, Guo-ping Ding, and De-xi Jing. Transumbilical Single-port Laparoscopic Cholecystectomy Using Traditional Laparoscopic Instruments: A Report of Thirty-six Cases. Zhejiang University Press, 2011.

Cao, Li-ping, et al. Transumbilical Single-port Laparoscopic Cholecystectomy Using Traditional Laparoscopic Instruments: A Report of Thirty-six Cases. Zhejiang University Press, 2011.