MLA

Marsh, Othniel Charles, 1831-1899. Moore, Charles. Box 23, folder 949. 1881. https://collections.library.yale.edu/catalog/32563814.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 23, folder 949"])(1881)[Moore, Charles]. https://collections.library.yale.edu/catalog/32563814.