ebrary, Inc, & Nicgorski, W. (2012). Cicero's practical philosophy. University of Notre Dame Press.
芝加哥风格引文ebrary, Inc, 与 Walter Nicgorski. Cicero's Practical Philosophy. Notre Dame, Ind.: University of Notre Dame Press, 2012.
MLA引文ebrary, Inc, 与 Walter Nicgorski. Cicero's Practical Philosophy. University of Notre Dame Press, 2012.
警告：这些引文格式不一定是100％准确.