MLA

Day, Jeremiah, 1773-1867. Letters. Box 8, folder 322-367. 1797-1863. https://collections.library.yale.edu/catalog/2067487.

APA, 6th edition

Day, Jeremiah, 1773-1867. (["Box 8, folder 322-367"])(1797-1863)[Letters]. https://collections.library.yale.edu/catalog/2067487.