APA引文

Callen, P. W. (1988). Ultrasonography in obstetrics and Gynecology.

Chicago Style (17th ed.) Citation

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.

MLA引文

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.

警告：這些引文格式不一定是100％准確.