APA (7th ed.) Citation

Callen, P. W. 2 Ultrasonography in Obstetrics and Gynecology 5.E. Saunders.

Chicago Style (17th ed.) Citation

Callen, Peter W. 2 Ultrasonography in Obstetrics and Gynecology 5.E. Saunders.

MLA (8th ed.) Citation

Callen, Peter W. 2 Ultrasonography in Obstetrics and Gynecology 5.E. Saunders.

Warning: These citations may not always be 100% accurate.