MLA

Kilpatrick, Jack Frederick (1915-1967). Financial record. Box 21, folder 1759a. 1941 March 25. https://collections.library.yale.edu/catalog/15532339.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 21, folder 1759a"])(1941 March 25)[Financial record]. https://collections.library.yale.edu/catalog/15532339.