Chicago
Memoranda https://www.govinfo.gov/app/details/USREPORTS-67/USREPORTS-67-FrontMatter-7.
APA
Memoranda https://www.govinfo.gov/app/details/USREPORTS-67/USREPORTS-67-FrontMatter-7.
MLA
Memoranda. https://www.govinfo.gov/app/details/USREPORTS-67/USREPORTS-67-FrontMatter-7.
Bluebook
Memoranda.