Music/Whittington: no. 33
MLA
Koch, Frederick R. (Frederick Robinson). Music/Whittington: no. 33. Box 281, folder 1623. n.d.. https://collections.library.yale.edu/catalog/12276586.
APA, 6th edition
Koch, Frederick R. (Frederick Robinson). (["Box 281, folder 1623"])(n.d.)[Music/Whittington: no. 33]. https://collections.library.yale.edu/catalog/12276586.