Cita APA (7a ed.)

Callen, P. W. (2000). Ultrasonography in obstetrics and gynecology: Peter W. Callen (4th ed.). Saunders.

Cita Chicago Style (17a ed.)

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology: Peter W. Callen. 4th ed. Philadelphia: Saunders, 2000.

Cita MLA (9a ed.)

Callen, Peter W. Ultrasonography in Obstetrics and Gynecology: Peter W. Callen. 4th ed. Saunders, 2000.