MLA

Marsh, Othniel Charles, 1831-1899. Gibbs, Wolcott (1822-1908). Box 12, folder 508. 1878-1883. https://collections.library.yale.edu/catalog/32557936.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 12, folder 508"])(1878-1883)[Gibbs, Wolcott (1822-1908)]. https://collections.library.yale.edu/catalog/32557936.