MLA

Eliot, George, 1819-1880. Letter, Saturday, to the Brays & Miss Hennell. Box 1. [1852 May 1]. https://collections.library.yale.edu/catalog/32366138.

APA, 6th edition

Eliot, George, 1819-1880. (["Box 1"])([1852 May 1])[Letter, Saturday, to the Brays & Miss Hennell]. https://collections.library.yale.edu/catalog/32366138.