Gonzales v. Williams is one of the Insular Cases, and because it was about the citizenship status of Isabel González of Puerto Rico, it stands out from the many other Insular Cases that focus on goods and tariffs.
Research: 

Burnett, Christina Duffy. "’They say I am not an American...’: The Noncitizen National and the Law of American Empire.” Virginia Journal of International Law. Vol. 48, No. 4. 2008.
Cases Adjudged in the Supreme Court of the United States at October Term, 1903. “Gonzalez v. Williams.” No. 225.. Argued December 4, 7, 1903.-Decided January 4, 1904. https://tile.loc.gov/storage-services/service/ll/usrep/usrep192/usrep192001/usrep192001.pdf
Connecticut General Assembly Office of Legislative Research. “OLR Research Report.” 3/3/1997. https://www.cga.ct.gov/PS97/rpt/olr/htm/97-R-0359.htm
Erman, Sam. “Almost Citizens: Puerto Rico, the U.S. Constitution, and Empire (Studies in Legal History).” Cambridge University Press. 2018.
Erman, Sam. “Meanings of Citizenship in the U.S. Empire: Puerto Rico, Isabel Gonzalez, and the Supreme Court, 1898 to 1905.” Journal of American Ethnic History. Summer 2008. Volume 27. Number 4. Via JSTOR. https://www.jstor.org/stable/27501851
Fifty-first Congress. “An act in amendment to the various acts relative to immigration and the importation of aliens under contract or agreement to perform labor.” chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/26/STATUTE-26-Pg1084a.pdf
Halperin, Anna Danziger. “Isabel González and Puerto Rican Citizenship: A Q&A with Historian Sam Erman.” New York Historical Society Museum and Library. https://www.nyhistory.org/blogs/isabel-gonzalez-and-puerto-rican-citizenship-a-qa-with-historian-sam-erman
On Petition for a Writ of Certiorari to the United States Court Of Appeals For The Tenth Circuit. “Brief of the Descendants of Dred Scott and Isabel Gonzalez as Amici Curae in support of the Petitioners.” No. 21-1394 in the Supreme Court of the United States.
Silsby, Gilen. “The Legal Story Behind Puerto Rico’s Colonial Conundrum.” USC TrojanFamily. Spring 2019. https://news.usc.edu/trojan-family/sam-erman-usc-puerto-rican-citizenship/
Silsby, Gilen. “Who in the world was Isabel Gonzalez?” With Sam Erman. USC Gould School of Law. 10/17/2018. https://gould.usc.edu/about/news/?id=4489
Women and the American Story. “Puerto Rican Citizenship.” https://wams.nyhistory.org/industry-and-empire/expansion-and-empire/puerto-rican-citizenship/
New-York tribune. [volume] (New York [N.Y.]), 25 Nov. 1906. Chronicling America: Historic American Newspapers. Lib. of Congress. https://chroniclingamerica.loc.gov/lccn/sn83030214/1906-11-25/ed-1/seq-13/
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