MLA

Kilpatrick, Jack Frederick (1915-1967). Historical note. Box 9, folder 830. 1930 August 14. https://collections.library.yale.edu/catalog/15493134.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 9, folder 830"])(1930 August 14)[Historical note]. https://collections.library.yale.edu/catalog/15493134.