APA引文

Viegas, O., Khaw, B., Ratnam, S., & GYNAECOLOGY, O. &. (2013). Tramadol in labour pain in primiparous patients. A prospective comparative clinical trial.

Chicago Style Citation

Viegas, O.A.C., B. Khaw, S.S Ratnam, and OBSTETRICS & GYNAECOLOGY. Tramadol in Labour Pain in Primiparous Patients. A Prospective Comparative Clinical Trial. 2013.

MLA引文

Viegas, O.A.C., B. Khaw, S.S Ratnam, and OBSTETRICS & GYNAECOLOGY. Tramadol in Labour Pain in Primiparous Patients. A Prospective Comparative Clinical Trial. 2013.

警告：這些引文格式不一定是100％准確.