Eastman. (1961). Williams obstetrics. Appleton Century-crofts.
Cita Chicago (17th ed.)Eastman. Williams Obstetrics. Appleton Century-crofts, 1961.
Cita MLA (9th ed.)Eastman. Williams Obstetrics. Appleton Century-crofts, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.