MLA

Marsh, Othniel Charles, 1831-1899. Veltman, R.. Box 33, folder 1412. 1871-1876. https://collections.library.yale.edu/catalog/32569163.

APA, 6th edition

Marsh, Othniel Charles, 1831-1899. (["Box 33, folder 1412"])(1871-1876)[Veltman, R.]. https://collections.library.yale.edu/catalog/32569163.