Eastman, N. J. (1956). Williams Obstetrics. New York: Appleton-Century-Crofts.
Trích dẫn kiểu ChicagoEastman, Nicholson J. Williams Obstetrics. New York: Appleton-Century-Crofts, 1956.
MLA引文Eastman, Nicholson J. Williams Obstetrics. New York: Appleton-Century-Crofts, 1956.
警告：这些引文格式不一定是100％准确.