MLA

Marsh, Othniel Charles, 1831-1899. 1857. Box 48, folder 12. 1857. https://collections.library.yale.edu/catalog/32571928.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 48, folder 12"])(1857)[1857]. https://collections.library.yale.edu/catalog/32571928.