APA

Ledger W. L., Sweeting V. M. & Chatterjee S. (19940630). Rapid diagnosis of early ectopic pregnancy in an emergency gynaecology service--are measurements of progesterone, intact and free beta human chorionic gonadotrophin helpful?. : Human reproduction (Oxford, England).

Chicago

Ledger W L, Sweeting V M and Chatterjee S. 19940630. Rapid diagnosis of early ectopic pregnancy in an emergency gynaecology service--are measurements of progesterone, intact and free beta human chorionic gonadotrophin helpful?. : Human reproduction (Oxford, England).

Harvard

Ledger W. L., Sweeting V. M. and Chatterjee S. (19940630). Rapid diagnosis of early ectopic pregnancy in an emergency gynaecology service--are measurements of progesterone, intact and free beta human chorionic gonadotrophin helpful?. : Human reproduction (Oxford, England).

MLA

Ledger W L, Sweeting V M and Chatterjee S. Rapid diagnosis of early ectopic pregnancy in an emergency gynaecology service--are measurements of progesterone, intact and free beta human chorionic gonadotrophin helpful?. : Human reproduction (Oxford, England). 19940630.