MLA

Kilpatrick, Jack Frederick (1915-1967). Obituary. Box 13, folder 1129. 1931 May 16. https://collections.library.yale.edu/catalog/15512449.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 13, folder 1129"])(1931 May 16)[Obituary]. https://collections.library.yale.edu/catalog/15512449.