Callen, P. W. (1988). Ultrasonography in obstetrics and Gynecology.
Cita Chicago (17th ed.)Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.
Cita MLA (9th ed.)Callen, Peter W. Ultrasonography in Obstetrics and Gynecology. 1988.
Atenció: Aquestes cites poden no estar 100% correctes.