MLA

Kilpatrick, Jack Frederick (1915-1967). Notice or memo, title "itsitsalagi itsehvi (you Cherokee where you live)". Box 14, folder 1266. undated. https://collections.library.yale.edu/catalog/15530900.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 14, folder 1266"])(undated)[Notice or memo, title "itsitsalagi itsehvi (you Cherokee where you live)"]. https://collections.library.yale.edu/catalog/15530900.