APA
O'Brien J. M., Barton J. R., Spirek A. J., Allen A. A. & McCaffrey F. M. (20010927). Prenatal diagnosis and outcome of a ruptured aneurysm arising from the left atrium. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.
Chicago
O'Brien J M, Barton J R, Spirek A J, Allen A A and McCaffrey F M. 20010927. Prenatal diagnosis and outcome of a ruptured aneurysm arising from the left atrium. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.
Harvard
O'Brien J. M., Barton J. R., Spirek A. J., Allen A. A. and McCaffrey F. M. (20010927). Prenatal diagnosis and outcome of a ruptured aneurysm arising from the left atrium. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.
MLA
O'Brien J M, Barton J R, Spirek A J, Allen A A and McCaffrey F M. Prenatal diagnosis and outcome of a ruptured aneurysm arising from the left atrium. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 20010927.