APA

Mahony B. S., Nyberg D. A., Luthy D. A., Hirsch J. H., Hickok D. E. & Petty C. N. (19910305). Translabial ultrasound of the third-trimester uterine cervix. Correlation with digital examination. : Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

Chicago

Mahony B S, Nyberg D A, Luthy D A, Hirsch J H, Hickok D E and Petty C N. 19910305. Translabial ultrasound of the third-trimester uterine cervix. Correlation with digital examination. : Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

Harvard

Mahony B. S., Nyberg D. A., Luthy D. A., Hirsch J. H., Hickok D. E. and Petty C. N. (19910305). Translabial ultrasound of the third-trimester uterine cervix. Correlation with digital examination. : Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

MLA

Mahony B S, Nyberg D A, Luthy D A, Hirsch J H, Hickok D E and Petty C N. Translabial ultrasound of the third-trimester uterine cervix. Correlation with digital examination. : Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine. 19910305.