MLA

Koch, Frederick R. (Frederick Robinson). Music/Resignazione. Box 325, folder 1780. 1877 Oct 25. https://collections.library.yale.edu/catalog/2018742.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 325, folder 1780"])(1877 Oct 25)[Music/Resignazione]. https://collections.library.yale.edu/catalog/2018742.