MLA

Eliot, George, 1819-1880. Letter, Monday, to the Brays & Miss Hennell. Box 1. [1852 Feb 2]. https://collections.library.yale.edu/catalog/32366128.

APA, 6th edition

Eliot, George, 1819-1880. (["Box 1"])([1852 Feb 2])[Letter, Monday, to the Brays & Miss Hennell]. https://collections.library.yale.edu/catalog/32366128.