MLA

Rudge, Olga, 1895-1996. Notes: books and authors. Box 13, folder 515. n.d.. https://collections.library.yale.edu/catalog/17082111.

APA, 6th edition

Rudge, Olga, 1895-1996. (["Box 13, folder 515"])(n.d.)[Notes: books and authors]. https://collections.library.yale.edu/catalog/17082111.