MLA

Marsh, Othniel Charles, 1831-1899. 1852. Box 48, folder 7. 1852. https://collections.library.yale.edu/catalog/32571836.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 48, folder 7"])(1852)[1852]. https://collections.library.yale.edu/catalog/32571836.