APA citiranje

Li, C., Zhao, W., Zhu, Q., Cao, S., Ping, H., Xi, X., . . . Zhang, J. (2015). Risk factors for ectopic pregnancy: A multi-center case-control study. BMC Pregnancy Childbirth.

Citação norma Chicago

Li, Cheng, et al. "Risk Factors for Ectopic Pregnancy: A Multi-center Case-control Study." BMC Pregnancy Childbirth 2015.

MLA citiranje

Li, Cheng, et al. "Risk Factors for Ectopic Pregnancy: A Multi-center Case-control Study." BMC Pregnancy Childbirth 2015.