MLA

Marsh, Othniel Charles, 1831-1899. 1855 November. Box 48, folder 26. 1855 November. https://collections.library.yale.edu/catalog/32572101.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 48, folder 26"])(1855 November)[1855 November]. https://collections.library.yale.edu/catalog/32572101.