MLA

Koch, Frederick R. (Frederick Robinson). Wolzogen, Alfred, Freiherr von. Box 47, folder 943-944. [1860]-64, n.d.. https://collections.library.yale.edu/catalog/12214805.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 47, folder 943-944"])([1860]-64, n.d.)[Wolzogen, Alfred, Freiherr von]. https://collections.library.yale.edu/catalog/12214805.