文本

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2025_countsby, author="Wolfram Research", title="{CountsBy}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/CountsBy.html}", note=[Accessed: 30-April-2026]}

BibLaTeX

@online{reference.wolfram_2025_countsby, organization={Wolfram Research}, title={CountsBy}, year={2014}, url={https://reference.wolfram.com/language/ref/CountsBy.html}, note=[Accessed: 30-April-2026]}