MLA

Kilpatrick, Jack Frederick (1915-1967). Death record. Box 7, folder 537. undated. https://collections.library.yale.edu/catalog/15492766.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 7, folder 537"])(undated)[Death record]. https://collections.library.yale.edu/catalog/15492766.