Callen, P. W. (2008). Ultrasonography in obstetrics and gynecology (5th ed.). Saunders Elsevier.
Chicago Style (17th ed.) CitationCallen, Peter W. Ultrasonography in Obstetrics and Gynecology. 5th ed. Philadelphia, PA: Saunders Elsevier, 2008.
MLA (9th ed.) CitationCallen, Peter W. Ultrasonography in Obstetrics and Gynecology. 5th ed. Saunders Elsevier, 2008.
Warning: These citations may not always be 100% accurate.