MLA

Koch, Frederick R. (Frederick Robinson). Sert, Misia. Box 6, folder 154-156. [1913]-34, n.d.. https://collections.library.yale.edu/catalog/16601828.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 6, folder 154-156"])([1913]-34, n.d.)[Sert, Misia]. https://collections.library.yale.edu/catalog/16601828.