MLA

Kilpatrick, Jack Frederick (1915-1967). Financial notes. Box 6, folder 447. undated. https://collections.library.yale.edu/catalog/15492365.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 6, folder 447"])(undated)[Financial notes]. https://collections.library.yale.edu/catalog/15492365.