MLA

Marsh, Othniel Charles, 1831-1899. Newton, R.. Box 25, folder 1002. 1884. https://collections.library.yale.edu/catalog/32564531.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 25, folder 1002"])(1884)[Newton, R.]. https://collections.library.yale.edu/catalog/32564531.