APA (7th ed.) Citation

Callen, P. W. (1988). Ultrasonography in obstetrics and gynecology (2nd ed.). Saunders.

Chicago Style (17th ed.) Citation

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 2nd ed. Philadelphia [etc.]: Saunders, 1988.

MLA (9th ed.) Citation

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 2nd ed. Saunders, 1988.

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