文本

Wolfram Research (2020)，$ExternalIdentifierTypes，Wolfram 语言函数，https://reference.wolfram.com/language/ref/$ExternalIdentifierTypes.html.

CMS

Wolfram 语言. 2020. "$ExternalIdentifierTypes." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/$ExternalIdentifierTypes.html.

APA

Wolfram 语言. (2020). $ExternalIdentifierTypes. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/$ExternalIdentifierTypes.html 年

BibTeX

@misc{reference.wolfram_2025_$externalidentifiertypes, author="Wolfram Research", title="{$ExternalIdentifierTypes}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/$ExternalIdentifierTypes.html}", note=[Accessed: 13-April-2026]}

BibLaTeX

@online{reference.wolfram_2025_$externalidentifiertypes, organization={Wolfram Research}, title={$ExternalIdentifierTypes}, year={2020}, url={https://reference.wolfram.com/language/ref/$ExternalIdentifierTypes.html}, note=[Accessed: 13-April-2026]}