Zimmermann, Madame
MLA
Koch, Frederick R. (Frederick Robinson). Zimmermann, Madame. Box 59, folder 1339. n.d.. https://collections.library.yale.edu/catalog/16601871.
APA, 6th edition
Koch, Frederick R. (Frederick Robinson). (["Box 59, folder 1339"])(n.d.)[Zimmermann, Madame]. https://collections.library.yale.edu/catalog/16601871.