Urdang international. (2020). Urdang international Summer Schools. Theurdang international.
芝加哥风格引文Urdang international. Urdang International Summer Schools. London: Theurdang international, 2020.
MLA引文Urdang international. Urdang International Summer Schools. Theurdang international, 2020.
警告：这些引文格式不一定是100％准确.