Cunningham, F. G. (2006). Obstetricia de Williams (22 ed.). McGraw - Hill.
芝加哥风格引文Cunningham, F. Gary. Obstetricia De Williams. 22 ed. México, D.F: McGraw - Hill, 2006.
MLA引文Cunningham, F. Gary. Obstetricia De Williams. 22 ed. McGraw - Hill, 2006.
警告：这些引文格式不一定是100％准确.