文本Wolfram Research (1988)，E，Wolfram 语言函数，https://reference.wolfram.com/language/ref/E.html （更新于 2002 年）.
CMSWolfram 语言. 1988. "E." Wolfram 语言与系统参考资料中心. Wolfram Research. 最新版本 2002. https://reference.wolfram.com/language/ref/E.html.
APAWolfram 语言. (1988). E. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/E.html 年
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