MLA

Koch, Frederick R. (Frederick Robinson). Petition requesting pardon for Jean Genet. Box 7, folder 182. n.d.. https://collections.library.yale.edu/catalog/16601831.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 7, folder 182"])(n.d.)[Petition requesting pardon for Jean Genet]. https://collections.library.yale.edu/catalog/16601831.