MLA

Marsh, Othniel Charles, 1831-1899. Rockwell, Charles. Box 28, folder 1170. 1877-1889. https://collections.library.yale.edu/catalog/32566297.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 28, folder 1170"])(1877-1889)[Rockwell, Charles]. https://collections.library.yale.edu/catalog/32566297.