APA引文

CALLEN, P. W. (2000). Ultrasonography in obstetrics and gynecology.-- ed.4. W.B. Saunders Company.

芝加哥风格引文

CALLEN, Peter W. Ultrasonography in Obstetrics and Gynecology.-- Ed.4. Philadelphia: W.B. Saunders Company, 2000.

MLA引文

CALLEN, Peter W. Ultrasonography in Obstetrics and Gynecology.-- Ed.4. W.B. Saunders Company, 2000.

警告：这些引文格式不一定是100％准确.