MLA

Kilpatrick, Jack Frederick (1915-1967). Financial record. Box 14, folder 1223. 1957 June 21. https://collections.library.yale.edu/catalog/15530859.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 14, folder 1223"])(1957 June 21)[Financial record]. https://collections.library.yale.edu/catalog/15530859.