MLA

Marsh, Othniel Charles, 1831-1899. Goldbacher, Joseph. Box 12, folder 526. 1872-1873. https://collections.library.yale.edu/catalog/32558136.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 12, folder 526"])(1872-1873)[Goldbacher, Joseph]. https://collections.library.yale.edu/catalog/32558136.