Bull, J., Rowland, S., Lundberg, O., Berglund-Scherwitzl, E., Gemzell-Danielsson, K., Trussell, J., & Scherwitzl, R. (2019). Typical use effectiveness of Natural Cycles: Postmarket surveillance study investigating the impact of previous contraceptive choice on the risk of unintended pregnancy. BMJ Open.
Čikaški stil citiranjaBull, Jonathan, Simon Rowland, Olof Lundberg, Elina Berglund-Scherwitzl, Kristina Gemzell-Danielsson, James Trussell, i Raoul Scherwitzl. "Typical Use Effectiveness of Natural Cycles: Postmarket Surveillance Study Investigating the Impact of Previous Contraceptive Choice On the Risk of Unintended Pregnancy." BMJ Open 2019.
MLA način citiranjaBull, Jonathan, et al. "Typical Use Effectiveness of Natural Cycles: Postmarket Surveillance Study Investigating the Impact of Previous Contraceptive Choice On the Risk of Unintended Pregnancy." BMJ Open 2019.