文本

Wolfram Research (2019)，ExternalValue，Wolfram 语言函数，https://reference.wolfram.com/language/ref/ExternalValue.html.

CMS

Wolfram 语言. 2019. "ExternalValue." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/ExternalValue.html.

APA

Wolfram 语言. (2019). ExternalValue. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/ExternalValue.html 年

BibTeX

@misc{reference.wolfram_2025_externalvalue, author="Wolfram Research", title="{ExternalValue}", year="2019", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalValue.html}", note=[Accessed: 14-April-2026]}

BibLaTeX

@online{reference.wolfram_2025_externalvalue, organization={Wolfram Research}, title={ExternalValue}, year={2019}, url={https://reference.wolfram.com/language/ref/ExternalValue.html}, note=[Accessed: 14-April-2026]}