MLA

Ely, William Davis, 1815-1908. Samson, Emily Apthorp. Box 1, folder 8. 1845. https://collections.library.yale.edu/catalog/32532189.

APA, 6th edition

Ely, William Davis, 1815-1908. (["Box 1, folder 8"])(1845)[Samson, Emily Apthorp]. https://collections.library.yale.edu/catalog/32532189.