Wolfram Research (1988)，Factorial2，Wolfram 语言函数，https://reference.wolfram.com/language/ref/Factorial2.html （更新于 2022 年）.

Wolfram 语言. 1988. "Factorial2." Wolfram 语言与系统参考资料中心. Wolfram Research. 最新版本 2022. https://reference.wolfram.com/language/ref/Factorial2.html.

Wolfram 语言. (1988). Factorial2. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/Factorial2.html 年

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@online{reference.wolfram_2024_factorial2, organization={Wolfram Research}, title={Factorial2}, year={2022}, url={https://reference.wolfram.com/language/ref/Factorial2.html}, note=[Accessed: 06-July-2024 ]}