APA Citation

Callen, P. W. (1994). Ultrasonography in obstetrics and gynecology (3rd ed.). Philadelphia: W.B. Saunders.

MLA Citation

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 3rd ed. Philadelphia: W.B. Saunders, 1994.

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