文本
Wolfram Research (2015)，Annulus，Wolfram 语言函数，https://reference.wolfram.com/language/ref/Annulus.html.
CMS
Wolfram 语言. 2015. "Annulus." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/Annulus.html.
APA
Wolfram 语言. (2015). Annulus. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/Annulus.html 年
BibTeX
@misc{reference.wolfram_2025_annulus, author="Wolfram Research", title="{Annulus}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/Annulus.html}", note=[Accessed: 27-April-2025
]}
BibLaTeX
@online{reference.wolfram_2025_annulus, organization={Wolfram Research}, title={Annulus}, year={2015}, url={https://reference.wolfram.com/language/ref/Annulus.html}, note=[Accessed: 27-April-2025
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