MLA

Marsh, Othniel Charles, 1831-1899. 1849. Box 48, folder 5. 1849. https://collections.library.yale.edu/catalog/32571825.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 48, folder 5"])(1849)[1849]. https://collections.library.yale.edu/catalog/32571825.