MLA

Marsh, Othniel Charles, 1831-1899. Couchi, Igino. Box 7, folder 294. 1899. https://collections.library.yale.edu/catalog/32555558.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 7, folder 294"])(1899)[Couchi, Igino]. https://collections.library.yale.edu/catalog/32555558.