Eastman, N. J. (1956). Williams Obstetrics. New York: Appleton-Century-Crofts.
Dyfyniad Arddull ChicagoEastman, Nicholson J. Williams Obstetrics. New York: Appleton-Century-Crofts, 1956.
Dyfyniad MLAEastman, Nicholson J. Williams Obstetrics. New York: Appleton-Century-Crofts, 1956.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.