Leveno, K. J. (2003). Williams manual of obstetrics (21st ed.). McGraw-Hill.
芝加哥风格引文Leveno, Kenneth J. Williams Manual of Obstetrics. 21st ed. Boston: McGraw-Hill, 2003.
MLA引文Leveno, Kenneth J. Williams Manual of Obstetrics. 21st ed. McGraw-Hill, 2003.
警告：这些引文格式不一定是100％准确.