APA

Frank-Herrmann P., Heil J., Gnoth C., Toledo E., Baur S., Pyper C., Jenetzky E., Strowitzki T. & Freundl G. (20070709). The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study. : Human reproduction (Oxford, England).

Chicago

Frank-Herrmann P, Heil J, Gnoth C, Toledo E, Baur S, Pyper C, Jenetzky E, Strowitzki T and Freundl G. 20070709. The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study. : Human reproduction (Oxford, England).

Harvard

Frank-Herrmann P., Heil J., Gnoth C., Toledo E., Baur S., Pyper C., Jenetzky E., Strowitzki T. and Freundl G. (20070709). The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study. : Human reproduction (Oxford, England).

MLA

Frank-Herrmann P, Heil J, Gnoth C, Toledo E, Baur S, Pyper C, Jenetzky E, Strowitzki T and Freundl G. The effectiveness of a fertility awareness based method to avoid pregnancy in relation to a couple's sexual behaviour during the fertile time: a prospective longitudinal study. : Human reproduction (Oxford, England). 20070709.