文本

Wolfram Research (2014)，$UnitSystem，Wolfram 语言函数，https://reference.wolfram.com/language/ref/$UnitSystem.html.

CMS

Wolfram 语言. 2014. "$UnitSystem." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/$UnitSystem.html.

APA

Wolfram 语言. (2014). $UnitSystem. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/$UnitSystem.html 年

BibTeX

@misc{reference.wolfram_2026_$unitsystem, author="Wolfram Research", title="{$UnitSystem}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/$UnitSystem.html}", note=[Accessed: 14-August-2026]}

BibLaTeX

@online{reference.wolfram_2026_$unitsystem, organization={Wolfram Research}, title={$UnitSystem}, year={2014}, url={https://reference.wolfram.com/language/ref/$UnitSystem.html}, note=[Accessed: 14-August-2026]}