MLA

Kilpatrick, Jack Frederick (1915-1967). Financial. Box 6, folder 453. undated. https://collections.library.yale.edu/catalog/15492367.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 6, folder 453"])(undated)[Financial]. https://collections.library.yale.edu/catalog/15492367.