文本

Wolfram Research (1988)，$System，Wolfram 语言函数，https://reference.wolfram.com/language/ref/$System.html.

CMS

Wolfram 语言. 1988. "$System." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/$System.html.

APA

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

BibTeX

@misc{reference.wolfram_2026_$system, author="Wolfram Research", title="{$System}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/$System.html}", note=[Accessed: 24-August-2026]}

BibLaTeX

@online{reference.wolfram_2026_$system, organization={Wolfram Research}, title={$System}, year={1988}, url={https://reference.wolfram.com/language/ref/$System.html}, note=[Accessed: 24-August-2026]}