MLA

Kilpatrick, Jack Frederick (1915-1967). Journal or note. Box 21, folder 1744. 1943 February. https://collections.library.yale.edu/catalog/15532323.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 21, folder 1744"])(1943 February)[Journal or note]. https://collections.library.yale.edu/catalog/15532323.