MLA

Kilpatrick, Jack Frederick (1915-1967). Obituary. Box 7, folder 535. circa 1891. https://collections.library.yale.edu/catalog/15492764.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 7, folder 535"])(circa 1891)[Obituary]. https://collections.library.yale.edu/catalog/15492764.