MLA

Marsh, Othniel Charles, 1831-1899. Flower, Georgiana Rosetta. Box 11, folder 473. 1885. https://collections.library.yale.edu/catalog/32557565.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 11, folder 473"])(1885)[Flower, Georgiana Rosetta]. https://collections.library.yale.edu/catalog/32557565.