MLA

Marsh, Othniel Charles, 1831-1899. 1856. Box 48, folder 11. 1856. https://collections.library.yale.edu/catalog/32571907.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 48, folder 11"])(1856)[1856]. https://collections.library.yale.edu/catalog/32571907.