Chicago
Pennsylvania v. Virginia https://www.govinfo.gov/app/details/USREPORTS-131/USREPORTS-131-BackMatter-39.
APA
Pennsylvania v. Virginia https://www.govinfo.gov/app/details/USREPORTS-131/USREPORTS-131-BackMatter-39.
MLA
Pennsylvania v. Virginia. https://www.govinfo.gov/app/details/USREPORTS-131/USREPORTS-131-BackMatter-39.
Bluebook
Pennsylvania v. Virginia.