Chicago
Index to Volume 420
https://www.govinfo.gov/app/details/USREPORTS-420/USREPORTS-420-BackMatter.
APA
Index to Volume 420
https://www.govinfo.gov/app/details/USREPORTS-420/USREPORTS-420-BackMatter.
MLA
Index to Volume 420.
https://www.govinfo.gov/app/details/USREPORTS-420/USREPORTS-420-BackMatter.
Bluebook
Index to Volume 420.