Katharina, v. S. (2007). The letters of Catherine of Siena. The letters of Catherine of Siena.
芝加哥风格引文Katharina, von Siena. "The Letters of Catherine of Siena." The Letters of Catherine of Siena 2007.
MLA引文Katharina, von Siena. "The Letters of Catherine of Siena." The Letters of Catherine of Siena, 2007.
警告：这些引文格式不一定是100％准确.