MLA

Eliot, George, 1819-1880. Telegram. Box 10. 1880 Dec 24. https://collections.library.yale.edu/catalog/32343935.

APA, 6th edition

Eliot, George, 1819-1880. (["Box 10"])(1880 Dec 24)[Telegram]. https://collections.library.yale.edu/catalog/32343935.