Cunningham, F. G., MacDonald, P. C., & Gant, N. F. (1996). Obstetricia de Williams.
芝加哥风格引文Cunningham, F. Gary, Paul C. MacDonald, 与 Norman F. Gant. Obstetricia De Williams. 1996.
MLA引文Cunningham, F. Gary, et al. Obstetricia De Williams. 1996.
警告：这些引文格式不一定是100％准确.