MLA

Kilpatrick, Jack Frederick (1915-1967). Grocery list. Box 22, folder 1783. undated. https://collections.library.yale.edu/catalog/15532587.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 22, folder 1783"])(undated)[Grocery list]. https://collections.library.yale.edu/catalog/15532587.