Eastman. (1961). Williams obstetrics. Appleton Century-crofts.
芝加哥风格引文Eastman. Williams Obstetrics. Appleton Century-crofts, 1961.
MLA引文Eastman. Williams Obstetrics. Appleton Century-crofts, 1961.
警告：这些引文格式不一定是100％准确.
APA引文