MLA

Gilman, Daniel C. (Daniel Coit), 1831-1908. Gilman, Elizabeth Coit. Box 3, folder 169. 1845. https://collections.library.yale.edu/catalog/32522841.

APA, 6th edition

Gilman, Daniel C. (Daniel Coit), 1831-1908. (["Box 3, folder 169"])(1845)[Gilman, Elizabeth Coit]. https://collections.library.yale.edu/catalog/32522841.