テキスト

Wolfram Research (2019), SPARQLOptional, Wolfram言語関数， https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html.

CMS

Wolfram Language. 2019. "SPARQLOptional." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html.

APA

Wolfram Language. (2019). SPARQLOptional. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html

BibTeX

@misc{reference.wolfram_2025_sparqloptional, author="Wolfram Research", title="{SPARQLOptional}", year="2019", howpublished="\url{https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html}", note=[Accessed: 18-April-2026]}

BibLaTeX

@online{reference.wolfram_2025_sparqloptional, organization={Wolfram Research}, title={SPARQLOptional}, year={2019}, url={https://reference.wolfram.com/language/GraphStore/ref/SPARQLOptional.html}, note=[Accessed: 18-April-2026]}