MLA

Draper, Muriel, 1886-1952. Draper, Muriel. Box 16, folder 543. n.d.. https://collections.library.yale.edu/catalog/2003241.

APA, 6th edition

Draper, Muriel, 1886-1952. (["Box 16, folder 543"])(n.d.)[Draper, Muriel]. https://collections.library.yale.edu/catalog/2003241.