Gaya APA

Protopapas, A. et al (2014). Ultrasound-assisted intraoperative localization and laparoscopic management of a previously missed unruptured retroperitoneal ectopic pregnancy (Gynecol Surg (2014) 11:207–211). USA: Springer.

Gaya MLA

Protopapas, Athanasios. et al. "Ultrasound-assisted intraoperative localization and laparoscopic management of a previously missed unruptured retroperitoneal ectopic pregnancy". Gynecol Surg (2014) 11:207–211 USA: Springer, 2014. Text.