APA način citiranja

Butts, S. F., Guo, W., Cary, M. S., Chung, K., Takacs, P., Sammel, M. D., & Barnhart, K. T. (2013). Predicting the Decline in Human Chorionic Gonadotropin in a Resolving Pregnancy of Unknown Location.

Čikaški stil citiranja

Butts, Samantha F., Wensheng Guo, Mark S. Cary, Karine Chung, Peter Takacs, Mary D. Sammel, i Kurt T. Barnhart. Predicting the Decline in Human Chorionic Gonadotropin in a Resolving Pregnancy of Unknown Location. 2013.

MLA način citiranja

Butts, Samantha F., et al. Predicting the Decline in Human Chorionic Gonadotropin in a Resolving Pregnancy of Unknown Location. 2013.