MLA

Rudge, Olga, 1895-1996. Music. Box 154, folder 3632-34. n.d.. https://collections.library.yale.edu/catalog/2013193.

APA, 6th edition

Rudge, Olga, 1895-1996. (["Box 154, folder 3632-34"])(n.d.)[Music]. https://collections.library.yale.edu/catalog/2013193.