APA

O'Brien J. M., Houseman B. A., Allen A. A. & Barton J. R. (20030516). Methylcellulose gel is a superior contrast agent for ultrasound examination of the cervix in obstetric patients. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Chicago

O'Brien J M, Houseman B A, Allen A A and Barton J R. 20030516. Methylcellulose gel is a superior contrast agent for ultrasound examination of the cervix in obstetric patients. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Harvard

O'Brien J. M., Houseman B. A., Allen A. A. and Barton J. R. (20030516). Methylcellulose gel is a superior contrast agent for ultrasound examination of the cervix in obstetric patients. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

MLA

O'Brien J M, Houseman B A, Allen A A and Barton J R. Methylcellulose gel is a superior contrast agent for ultrasound examination of the cervix in obstetric patients. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 20030516.